64736644 has 18 divisors (see below), whose sum is σ = 131785710. Its totient is φ = 27744192.

The previous prime is 64736627. The next prime is 64736669. The reversal of 64736644 is 44663746.

It can be written as a sum of positive squares in only one way, i.e., 48024900 + 16711744 = 6930^2 + 4088^2 .

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 64736597 and 64736606.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164949 + ... + 165340.

Almost surely, 2^64736644 is an apocalyptic number.

It is an amenable number.

64736644 is an abundant number, since it is smaller than the sum of its proper divisors (67049066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64736644 is a wasteful number, since it uses less digits than its factorization.

64736644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330307 (or 330298 counting only the distinct ones).

The product of its digits is 290304, while the sum is 40.

The square root of 64736644 is about 8045.9085254557. The cubic root of 64736644 is about 401.5288242962.

The spelling of 64736644 in words is "sixty-four million, seven hundred thirty-six thousand, six hundred forty-four".