78120859 has 2 divisors, whose sum is σ = 78120860. Its totient is φ = 78120858.

The previous prime is 78120841. The next prime is 78120863. The reversal of 78120859 is 95802187.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78120859 - 2⁵ = 78120827 is a prime.

It is a super-2 number, since 2×78120859² = 12205737221795762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78120829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39060429 + 39060430.

It is an arithmetic number, because the mean of its divisors is an integer number (39060430).

Almost surely, 2^78120859 is an apocalyptic number.

78120859 is a deficient number, since it is larger than the sum of its proper divisors (1).

78120859 is an equidigital number, since it uses as much as digits as its factorization.

78120859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 78120859 is about 8838.6005113932. The cubic root of 78120859 is about 427.4864334580.

The spelling of 78120859 in words is "seventy-eight million, one hundred twenty thousand, eight hundred fifty-nine".