157928638 has 32 divisors (see below), whose sum is σ = 281211840. Its totient is φ = 65111040.

The previous prime is 157928629. The next prime is 157928651. The reversal of 157928638 is 836829751.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 157928591 and 157928600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40018 + ... + 43786.

It is an arithmetic number, because the mean of its divisors is an integer number (8787870).

Almost surely, 2^157928638 is an apocalyptic number.

157928638 is a deficient number, since it is larger than the sum of its proper divisors (123283202).

157928638 is a wasteful number, since it uses less digits than its factorization.

157928638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892.

The product of its digits is 725760, while the sum is 49.

The square root of 157928638 is about 12566.9661414360. The cubic root of 157928638 is about 540.5306146964.

The spelling of 157928638 in words is "one hundred fifty-seven million, nine hundred twenty-eight thousand, six hundred thirty-eight".