64644088 has 16 divisors (see below), whose sum is σ = 121320360. Its totient is φ = 32292000.

The previous prime is 64644077. The next prime is 64644089. The reversal of 64644088 is 88044646.

It is a super-2 number, since 2×64644088² = 8357716226703488, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64644088.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7303 + ... + 13513.

Almost surely, 2^64644088 is an apocalyptic number.

It is an amenable number.

64644088 is a deficient number, since it is larger than the sum of its proper divisors (56676272).

64644088 is a wasteful number, since it uses less digits than its factorization.

64644088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7518 (or 7514 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 64644088 is about 8040.1547248794. The cubic root of 64644088 is about 401.3373735964.

The spelling of 64644088 in words is "sixty-four million, six hundred forty-four thousand, eighty-eight".