64644632 has 16 divisors (see below), whose sum is σ = 130532640. Its totient is φ = 29835936.

The previous prime is 64644617. The next prime is 64644637. The reversal of 64644632 is 23644646.

64644632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64644592 and 64644601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310688 + ... + 310895.

It is an arithmetic number, because the mean of its divisors is an integer number (8158290).

Almost surely, 2^64644632 is an apocalyptic number.

It is an amenable number.

64644632 is an abundant number, since it is smaller than the sum of its proper divisors (65888008).

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

64644632 is a wasteful number, since it uses less digits than its factorization.

64644632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621602 (or 621598 counting only the distinct ones).

The product of its digits is 82944, while the sum is 35.

The square root of 64644632 is about 8040.1885550029. The cubic root of 64644632 is about 401.3384993859.

The spelling of 64644632 in words is "sixty-four million, six hundred forty-four thousand, six hundred thirty-two".