7978659057 has 8 divisors (see below), whose sum is σ = 11820235680. Its totient is φ = 5319106020.

The previous prime is 7978659053. The next prime is 7978659077. The reversal of 7978659057 is 7509568797.

It is not a de Polignac number, because 7978659057 - 2² = 7978659053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7978658985 and 7978659003.

It is not an unprimeable number, because it can be changed into a prime (7978659053) 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, 147752919 + ... + 147752972.

It is an arithmetic number, because the mean of its divisors is an integer number (1477529460).

Almost surely, 2^7978659057 is an apocalyptic number.

It is an amenable number.

7978659057 is a deficient number, since it is larger than the sum of its proper divisors (3841576623).

7978659057 is a wasteful number, since it uses less digits than its factorization.

7978659057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295505900 (or 295505894 counting only the distinct ones).

The product of its (nonzero) digits is 33339600, while the sum is 63.

The square root of 7978659057 is about 89323.3399341964. The cubic root of 7978659057 is about 1998.2200043611.

The spelling of 7978659057 in words is "seven billion, nine hundred seventy-eight million, six hundred fifty-nine thousand, fifty-seven".