64690913 has 4 divisors (see below), whose sum is σ = 73932480. Its totient is φ = 55449348.

The previous prime is 64690903. The next prime is 64690939. The reversal of 64690913 is 31909646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64690913 - 2⁶ = 64690849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64690903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4620773 + ... + 4620786.

It is an arithmetic number, because the mean of its divisors is an integer number (18483120).

Almost surely, 2^64690913 is an apocalyptic number.

It is an amenable number.

64690913 is a deficient number, since it is larger than the sum of its proper divisors (9241567).

64690913 is an equidigital number, since it uses as much as digits as its factorization.

64690913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9241566.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 64690913 is about 8043.0661442015. The cubic root of 64690913 is about 401.4342532309.

The spelling of 64690913 in words is "sixty-four million, six hundred ninety thousand, nine hundred thirteen".