157811978 has 16 divisors (see below), whose sum is σ = 244147200. Its totient is φ = 76458816.

The previous prime is 157811963. The next prime is 157811981. The reversal of 157811978 is 879118751.

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, 3698 + ... + 18146.

It is an arithmetic number, because the mean of its divisors is an integer number (15259200).

Almost surely, 2^157811978 is an apocalyptic number.

157811978 is a deficient number, since it is larger than the sum of its proper divisors (86335222).

157811978 is a wasteful number, since it uses less digits than its factorization.

157811978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14621.

The product of its digits is 141120, while the sum is 47.

The square root of 157811978 is about 12562.3237500074. The cubic root of 157811978 is about 540.3974874066.

The spelling of 157811978 in words is "one hundred fifty-seven million, eight hundred eleven thousand, nine hundred seventy-eight".