64396644 has 48 divisors (see below), whose sum is σ = 162335040. Its totient is φ = 19751040.

The previous prime is 64396639. The next prime is 64396649. The reversal of 64396644 is 44669346.

It is an interprime number because it is at equal distance from previous prime (64396639) and next prime (64396649).

It is a junction number, because it is equal to n+sod(n) for n = 64396596 and 64396605.

It is not an unprimeable number, because it can be changed into a prime (64396649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78999 + ... + 79809.

It is an arithmetic number, because the mean of its divisors is an integer number (3381980).

Almost surely, 2^64396644 is an apocalyptic number.

It is an amenable number.

64396644 is an abundant number, since it is smaller than the sum of its proper divisors (97938396).

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

64396644 is a wasteful number, since it uses less digits than its factorization.

64396644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 1338 counting only the distinct ones).

The product of its digits is 373248, while the sum is 42.

The square root of 64396644 is about 8024.7519587835. The cubic root of 64396644 is about 400.8246404188.

The spelling of 64396644 in words is "sixty-four million, three hundred ninety-six thousand, six hundred forty-four".