64712891 has 4 divisors (see below), whose sum is σ = 66944400. Its totient is φ = 62481384.

The previous prime is 64712867. The next prime is 64712941. The reversal of 64712891 is 19821746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64712891 - 2⁶ = 64712827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64712491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115711 + ... + 1115768.

It is an arithmetic number, because the mean of its divisors is an integer number (16736100).

Almost surely, 2^64712891 is an apocalyptic number.

64712891 is a deficient number, since it is larger than the sum of its proper divisors (2231509).

64712891 is a wasteful number, since it uses less digits than its factorization.

64712891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231508.

The product of its digits is 24192, while the sum is 38.

The square root of 64712891 is about 8044.4322981799. The cubic root of 64712891 is about 401.4797089869.

The spelling of 64712891 in words is "sixty-four million, seven hundred twelve thousand, eight hundred ninety-one".