157642978 has 8 divisors (see below), whose sum is σ = 236592720. Its totient is φ = 78778740.

The previous prime is 157642957. The next prime is 157643011. The reversal of 157642978 is 879246751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16548 + ... + 24271.

It is an arithmetic number, because the mean of its divisors is an integer number (29574090).

Almost surely, 2^157642978 is an apocalyptic number.

157642978 is a deficient number, since it is larger than the sum of its proper divisors (78949742).

157642978 is a wasteful number, since it uses less digits than its factorization.

157642978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42752.

The product of its digits is 846720, while the sum is 49.

The square root of 157642978 is about 12555.5954856789. The cubic root of 157642978 is about 540.2045155834.

The spelling of 157642978 in words is "one hundred fifty-seven million, six hundred forty-two thousand, nine hundred seventy-eight".