8157332978 has 16 divisors (see below), whose sum is σ = 12308803416. Its totient is φ = 4054417920.

The previous prime is 8157332971. The next prime is 8157333001. The reversal of 8157332978 is 8792337518.

It can be written as a sum of positive squares in 4 ways, for example, as 5335279849 + 2822053129 = 73043^2 + 53123^2 .

It is not an unprimeable number, because it can be changed into a prime (8157332971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580450 + ... + 1585602.

Almost surely, 2^8157332978 is an apocalyptic number.

8157332978 is a deficient number, since it is larger than the sum of its proper divisors (4151470438).

8157332978 is a wasteful number, since it uses less digits than its factorization.

8157332978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9709.

The product of its digits is 2540160, while the sum is 53.

The square root of 8157332978 is about 90317.9549037731. The cubic root of 8157332978 is about 2013.0260582172.

The spelling of 8157332978 in words is "eight billion, one hundred fifty-seven million, three hundred thirty-two thousand, nine hundred seventy-eight".