155798028 has 18 divisors (see below), whose sum is σ = 393822884. Its totient is φ = 51932664.

The previous prime is 155798017. The next prime is 155798077. The reversal of 155798028 is 820897551.

It is a happy number.

155798028 is a `hidden beast` number, since 1 + 557 + 98 + 0 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2163826 + ... + 2163897.

Almost surely, 2^155798028 is an apocalyptic number.

155798028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

155798028 is an abundant number, since it is smaller than the sum of its proper divisors (238024856).

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

155798028 is a wasteful number, since it uses less digits than its factorization.

155798028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327733 (or 4327728 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 155798028 is about 12481.9080272208. The cubic root of 155798028 is about 538.0888407435.

The spelling of 155798028 in words is "one hundred fifty-five million, seven hundred ninety-eight thousand, twenty-eight".