64575861 has 32 divisors (see below), whose sum is σ = 101606400. Its totient is φ = 35713920.

The previous prime is 64575857. The next prime is 64575887. The reversal of 64575861 is 16857546.

It is not a de Polignac number, because 64575861 - 2² = 64575857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64575811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153910 + ... + 154328.

It is an arithmetic number, because the mean of its divisors is an integer number (3175200).

Almost surely, 2^64575861 is an apocalyptic number.

It is an amenable number.

64575861 is a deficient number, since it is larger than the sum of its proper divisors (37030539).

64575861 is a wasteful number, since it uses less digits than its factorization.

64575861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649.

The product of its digits is 201600, while the sum is 42.

The square root of 64575861 is about 8035.9107137897. The cubic root of 64575861 is about 401.1961300337.

The spelling of 64575861 in words is "sixty-four million, five hundred seventy-five thousand, eight hundred sixty-one".