155690028 has 72 divisors (see below), whose sum is σ = 446154800. Its totient is φ = 45380736.

The previous prime is 155690027. The next prime is 155690039. The reversal of 155690028 is 820096551.

It is a happy number.

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 = 155689974 and 155690001.

It is not an unprimeable number, because it can be changed into a prime (155690023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138 + ... + 17646.

Almost surely, 2^155690028 is an apocalyptic number.

155690028 is a gapful number since it is divisible by the number (18) 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 155690028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223077400).

155690028 is an abundant number, since it is smaller than the sum of its proper divisors (290464772).

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

155690028 is a wasteful number, since it uses less digits than its factorization.

155690028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17551 (or 17546 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 155690028 is about 12477.5810155655. The cubic root of 155690028 is about 537.9644766787.

The spelling of 155690028 in words is "one hundred fifty-five million, six hundred ninety thousand, twenty-eight".