30157638728 has 32 divisors (see below), whose sum is σ = 64676156160. Its totient is φ = 12914173440.

The previous prime is 30157638713. The next prime is 30157638739. The reversal of 30157638728 is 82783675103.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149801 + ... + 287672.

It is an arithmetic number, because the mean of its divisors is an integer number (2021129880).

Almost surely, 2^30157638728 is an apocalyptic number.

It is an amenable number.

30157638728 is an abundant number, since it is smaller than the sum of its proper divisors (34518517432).

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

30157638728 is a wasteful number, since it uses less digits than its factorization.

30157638728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438717 (or 438713 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 30157638728 in words is "thirty billion, one hundred fifty-seven million, six hundred thirty-eight thousand, seven hundred twenty-eight".