155280540 has 144 divisors (see below), whose sum is σ = 470074752. Its totient is φ = 38282112.

The previous prime is 155280539. The next prime is 155280547. The reversal of 155280540 is 45082551.

It is a super-2 number, since 2×155280540² = 48224092205383200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 155280498 and 155280507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155280547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1451167 + ... + 1451273.

It is an arithmetic number, because the mean of its divisors is an integer number (3264408).

Almost surely, 2^155280540 is an apocalyptic number.

155280540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155280540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235037376).

155280540 is an abundant number, since it is smaller than the sum of its proper divisors (314794212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155280540 is a wasteful number, since it uses less digits than its factorization.

155280540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 155280540 is about 12461.1612620975. The cubic root of 155280540 is about 537.4924203005.

The spelling of 155280540 in words is "one hundred fifty-five million, two hundred eighty thousand, five hundred forty".