64109865 has 32 divisors (see below), whose sum is σ = 106686720. Its totient is φ = 32834816.

The previous prime is 64109827. The next prime is 64109879. The reversal of 64109865 is 56890146.

It is a cyclic number.

It is not a de Polignac number, because 64109865 - 2¹³ = 64101673 is a prime.

It is a super-2 number, since 2×64109865² = 8220149580636450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127204 + ... + 127706.

It is an arithmetic number, because the mean of its divisors is an integer number (3333960).

Almost surely, 2^64109865 is an apocalyptic number.

It is an amenable number.

64109865 is a deficient number, since it is larger than the sum of its proper divisors (42576855).

64109865 is a wasteful number, since it uses less digits than its factorization.

64109865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 64109865 is about 8006.8636181716. The cubic root of 64109865 is about 400.2287545701.

The spelling of 64109865 in words is "sixty-four million, one hundred nine thousand, eight hundred sixty-five".