155615328 has 72 divisors (see below), whose sum is σ = 482771016. Its totient is φ = 47155200.

The previous prime is 155615311. The next prime is 155615329. The reversal of 155615328 is 823516551.

It is a happy number.

155615328 is a `hidden beast` number, since 1 + 5 + 5 + 615 + 32 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×155615328² = 48432260617095168, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 155615292 and 155615301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155615329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21393 + ... + 27728.

It is an arithmetic number, because the mean of its divisors is an integer number (6705153).

Almost surely, 2^155615328 is an apocalyptic number.

155615328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

155615328 is an abundant number, since it is smaller than the sum of its proper divisors (327155688).

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

155615328 is a wasteful number, since it uses less digits than its factorization.

155615328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49148 (or 49137 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The square root of 155615328 is about 12474.5872877623. The cubic root of 155615328 is about 537.8784245495.

The spelling of 155615328 in words is "one hundred fifty-five million, six hundred fifteen thousand, three hundred twenty-eight".