78607813 has 12 divisors (see below), whose sum is σ = 87017868. Its totient is φ = 70759040.

The previous prime is 78607801. The next prime is 78607843. The reversal of 78607813 is 31870687.

It can be written as a sum of positive squares in 2 ways, for example, as 37429924 + 41177889 = 6118^2 + 6417^2 .

It is not a de Polignac number, because 78607813 - 2²¹ = 76510661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78607843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4623 + ... + 13363.

It is an arithmetic number, because the mean of its divisors is an integer number (7251489).

Almost surely, 2^78607813 is an apocalyptic number.

It is an amenable number.

78607813 is a deficient number, since it is larger than the sum of its proper divisors (8410055).

78607813 is a wasteful number, since it uses less digits than its factorization.

78607813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8804 (or 8781 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 78607813 is about 8866.1047253007. The cubic root of 78607813 is about 428.3728172794.

The spelling of 78607813 in words is "seventy-eight million, six hundred seven thousand, eight hundred thirteen".