155998628 has 6 divisors (see below), whose sum is σ = 272997606. Its totient is φ = 77999312.

The previous prime is 155998621. The next prime is 155998637. The reversal of 155998628 is 826899551.

It can be written as a sum of positive squares in only one way, i.e., 137405284 + 18593344 = 11722^2 + 4312^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155998628.

It is not an unprimeable number, because it can be changed into a prime (155998621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19499825 + ... + 19499832.

It is an arithmetic number, because the mean of its divisors is an integer number (45499601).

Almost surely, 2^155998628 is an apocalyptic number.

It is an amenable number.

155998628 is a deficient number, since it is larger than the sum of its proper divisors (116998978).

155998628 is a wasteful number, since it uses less digits than its factorization.

155998628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38999661 (or 38999659 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 53.

The square root of 155998628 is about 12489.9410727193. The cubic root of 155998628 is about 538.3196830486.

The spelling of 155998628 in words is "one hundred fifty-five million, nine hundred ninety-eight thousand, six hundred twenty-eight".