64421115 has 32 divisors (see below), whose sum is σ = 118368000. Its totient is φ = 29589120.

The previous prime is 64421111. The next prime is 64421179. The reversal of 64421115 is 51112446.

It is a happy number.

It is not a de Polignac number, because 64421115 - 2² = 64421111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64421111) 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, 7140 + ... + 13409.

It is an arithmetic number, because the mean of its divisors is an integer number (3699000).

Almost surely, 2^64421115 is an apocalyptic number.

64421115 is a deficient number, since it is larger than the sum of its proper divisors (53946885).

64421115 is a wasteful number, since it uses less digits than its factorization.

64421115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20587.

The product of its digits is 960, while the sum is 24.

The square root of 64421115 is about 8026.2765339851. The cubic root of 64421115 is about 400.8754056813.

It can be divided in two parts, 6442 and 1115, that added together give a palindrome (7557).

The spelling of 64421115 in words is "sixty-four million, four hundred twenty-one thousand, one hundred fifteen".