155620728 has 48 divisors (see below), whose sum is σ = 436012200. Its totient is φ = 50084160.

The previous prime is 155620727. The next prime is 155620769. The reversal of 155620728 is 827026551.

It is a happy number.

155620728 is a `hidden beast` number, since 1 + 5 + 5 + 620 + 7 + 28 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 = 155620692 and 155620701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155620727) 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 11 ways as a sum of consecutive naturals, for example, 35178 + ... + 39353.

Almost surely, 2^155620728 is an apocalyptic number.

155620728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

155620728 is an abundant number, since it is smaller than the sum of its proper divisors (280391472).

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

155620728 is a wasteful number, since it uses less digits than its factorization.

155620728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74572 (or 74565 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 155620728 is about 12474.8037259109. The cubic root of 155620728 is about 537.8846461086.

The spelling of 155620728 in words is "one hundred fifty-five million, six hundred twenty thousand, seven hundred twenty-eight".