64000491 has 8 divisors (see below), whose sum is σ = 87640464. Its totient is φ = 41513760.

The previous prime is 64000481. The next prime is 64000499. The reversal of 64000491 is 19400046.

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

It is not a de Polignac number, because 64000491 - 2⁹ = 63999979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64000499) 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, 288180 + ... + 288401.

It is an arithmetic number, because the mean of its divisors is an integer number (10955058).

Almost surely, 2^64000491 is an apocalyptic number.

64000491 is a deficient number, since it is larger than the sum of its proper divisors (23639973).

64000491 is a wasteful number, since it uses less digits than its factorization.

64000491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576621.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 64000491 is about 8000.0306874411. The cubic root of 64000491 is about 400.0010229141.

The spelling of 64000491 in words is "sixty-four million, four hundred ninety-one", and thus it is an aban number.