63994064 has 10 divisors (see below), whose sum is σ = 123988530. Its totient is φ = 31997024.

The previous prime is 63994061. The next prime is 63994067. The reversal of 63994064 is 46049936.

It is an interprime number because it is at equal distance from previous prime (63994061) and next prime (63994067).

It can be written as a sum of positive squares in only one way, i.e., 35904064 + 28090000 = 5992^2 + 5300^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63994061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999799 + ... + 1999830.

It is an arithmetic number, because the mean of its divisors is an integer number (12398853).

Almost surely, 2^63994064 is an apocalyptic number.

It is an amenable number.

63994064 is a deficient number, since it is larger than the sum of its proper divisors (59994466).

63994064 is a wasteful number, since it uses less digits than its factorization.

63994064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999637 (or 3999631 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 63994064 is about 7999.6289913970. The cubic root of 63994064 is about 399.9876329510.

The spelling of 63994064 in words is "sixty-three million, nine hundred ninety-four thousand, sixty-four".