7656813 has 12 divisors (see below), whose sum is σ = 11164608. Its totient is φ = 5056200.

The previous prime is 7656809. The next prime is 7656821. The reversal of 7656813 is 3186567.

It is not a de Polignac number, because 7656813 - 2² = 7656809 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

7656813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7656823) 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, 3013 + ... + 4938.

It is an arithmetic number, because the mean of its divisors is an integer number (930384).

Almost surely, 2^7656813 is an apocalyptic number.

It is an amenable number.

7656813 is a deficient number, since it is larger than the sum of its proper divisors (3507795).

7656813 is a wasteful number, since it uses less digits than its factorization.

7656813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8064 (or 8061 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 7656813 is about 2767.0946857670. The cubic root of 7656813 is about 197.0982100263.

The spelling of 7656813 in words is "seven million, six hundred fifty-six thousand, eight hundred thirteen".