78677793 has 6 divisors (see below), whose sum is σ = 113645714. Its totient is φ = 52451856.

The previous prime is 78677791. The next prime is 78677843. The reversal of 78677793 is 39777687.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 69605649 + 9072144 = 8343^2 + 3012^2 .

It is not a de Polignac number, because 78677793 - 2¹ = 78677791 is a prime.

It is a super-2 number, since 2×78677793² = 12380390222701698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78677791) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4370980 + ... + 4370997.

Almost surely, 2^78677793 is an apocalyptic number.

It is an amenable number.

78677793 is a deficient number, since it is larger than the sum of its proper divisors (34967921).

78677793 is a wasteful number, since it uses less digits than its factorization.

78677793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8741983 (or 8741980 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 54.

The square root of 78677793 is about 8870.0503380759. The cubic root of 78677793 is about 428.4998981095.

The spelling of 78677793 in words is "seventy-eight million, six hundred seventy-seven thousand, seven hundred ninety-three".