155072840 has 64 divisors (see below), whose sum is σ = 381447360. Its totient is φ = 56390400.

The previous prime is 155072839. The next prime is 155072843. The reversal of 155072840 is 48270551.

It is a junction number, because it is equal to n+sod(n) for n = 155072797 and 155072806.

It is not an unprimeable number, because it can be changed into a prime (155072843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32615 + ... + 37065.

It is an arithmetic number, because the mean of its divisors is an integer number (5960115).

Almost surely, 2^155072840 is an apocalyptic number.

155072840 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 155072840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190723680).

155072840 is an abundant number, since it is smaller than the sum of its proper divisors (226374520).

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

155072840 is a wasteful number, since it uses less digits than its factorization.

155072840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4542 (or 4538 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 155072840 is about 12452.8245791868. The cubic root of 155072840 is about 537.2526671689.

The spelling of 155072840 in words is "one hundred fifty-five million, seventy-two thousand, eight hundred forty".