63664400 has 30 divisors (see below), whose sum is σ = 152954682. Its totient is φ = 25465600.

The previous prime is 63664399. The next prime is 63664409. The reversal of 63664400 is 446636.

It can be written as a sum of positive squares in 3 ways, for example, as 14776336 + 48888064 = 3844^2 + 6992^2 .

It is not an unprimeable number, because it can be changed into a prime (63664409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79181 + ... + 79980.

Almost surely, 2^63664400 is an apocalyptic number.

It is an amenable number.

63664400 is an abundant number, since it is smaller than the sum of its proper divisors (89290282).

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

63664400 is a wasteful number, since it uses less digits than its factorization.

63664400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159179 (or 159168 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 63664400 is about 7978.9974307553. The cubic root of 63664400 is about 399.2996076756.

The spelling of 63664400 in words is "sixty-three million, six hundred sixty-four thousand, four hundred".