155393280 has 432 divisors, whose sum is σ = 642829824. Its totient is φ = 33914880.

The previous prime is 155393261. The next prime is 155393309. The reversal of 155393280 is 82393551.

155393280 is a `hidden beast` number, since 15 + 539 + 32 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3306217 + ... + 3306263.

It is an arithmetic number, because the mean of its divisors is an integer number (1488032).

Almost surely, 2^155393280 is an apocalyptic number.

155393280 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 155393280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321414912).

155393280 is an abundant number, since it is smaller than the sum of its proper divisors (487436544).

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

155393280 is a wasteful number, since it uses less digits than its factorization.

155393280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 155393280 is about 12465.6840967514. The cubic root of 155393280 is about 537.6224692990.

The spelling of 155393280 in words is "one hundred fifty-five million, three hundred ninety-three thousand, two hundred eighty".