78860651 has 2 divisors, whose sum is σ = 78860652. Its totient is φ = 78860650.

The previous prime is 78860647. The next prime is 78860669. The reversal of 78860651 is 15606887.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78860651 - 2² = 78860647 is a prime.

It is a super-2 number, since 2×78860651² = 12438004552287602, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 78860599 and 78860608.

It is not a weakly prime, because it can be changed into another prime (78860641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39430325 + 39430326.

It is an arithmetic number, because the mean of its divisors is an integer number (39430326).

Almost surely, 2^78860651 is an apocalyptic number.

78860651 is a deficient number, since it is larger than the sum of its proper divisors (1).

78860651 is an equidigital number, since it uses as much as digits as its factorization.

78860651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 78860651 is about 8880.3519637456. The cubic root of 78860651 is about 428.8316054750.

The spelling of 78860651 in words is "seventy-eight million, eight hundred sixty thousand, six hundred fifty-one".