64456691 has 8 divisors (see below), whose sum is σ = 69963264. Its totient is φ = 59028480.

The previous prime is 64456681. The next prime is 64456703. The reversal of 64456691 is 19665446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64456691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64456661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17870 + ... + 21171.

It is an arithmetic number, because the mean of its divisors is an integer number (8745408).

Almost surely, 2^64456691 is an apocalyptic number.

64456691 is a deficient number, since it is larger than the sum of its proper divisors (5506573).

64456691 is a wasteful number, since it uses less digits than its factorization.

64456691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39181.

The product of its digits is 155520, while the sum is 41.

The square root of 64456691 is about 8028.4924487727. The cubic root of 64456691 is about 400.9491854193.

The spelling of 64456691 in words is "sixty-four million, four hundred fifty-six thousand, six hundred ninety-one".