64638770 has 16 divisors (see below), whose sum is σ = 132971328. Its totient is φ = 22161840.

The previous prime is 64638737. The next prime is 64638797. The reversal of 64638770 is 7783646.

It is a super-2 number, since 2×64638770² = 8356341174225800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461636 + ... + 461775.

It is an arithmetic number, because the mean of its divisors is an integer number (8310708).

Almost surely, 2^64638770 is an apocalyptic number.

64638770 is an abundant number, since it is smaller than the sum of its proper divisors (68332558).

64638770 is a wasteful number, since it uses less digits than its factorization.

64638770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923425.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 64638770 is about 8039.8240030488. The cubic root of 64638770 is about 401.3263678429.

The spelling of 64638770 in words is "sixty-four million, six hundred thirty-eight thousand, seven hundred seventy".