64879691 has 2 divisors, whose sum is σ = 64879692. Its totient is φ = 64879690.

The previous prime is 64879687. The next prime is 64879739. The reversal of 64879691 is 19697846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64879691 - 2² = 64879687 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64879891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32439845 + 32439846.

It is an arithmetic number, because the mean of its divisors is an integer number (32439846).

Almost surely, 2^64879691 is an apocalyptic number.

64879691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64879691 is an equidigital number, since it uses as much as digits as its factorization.

64879691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 64879691 is about 8054.7930451378. The cubic root of 64879691 is about 401.8243562442.

The spelling of 64879691 in words is "sixty-four million, eight hundred seventy-nine thousand, six hundred ninety-one".