63991002 has 16 divisors (see below), whose sum is σ = 128799072. Its totient is φ = 21194160.

The previous prime is 63990989. The next prime is 63991003. The reversal of 63991002 is 20019936.

It is not an unprimeable number, because it can be changed into a prime (63991003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33024 + ... + 34907.

It is an arithmetic number, because the mean of its divisors is an integer number (8049942).

Almost surely, 2^63991002 is an apocalyptic number.

63991002 is an abundant number, since it is smaller than the sum of its proper divisors (64808070).

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

63991002 is a wasteful number, since it uses less digits than its factorization.

63991002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68093.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 63991002 is about 7999.4376052320. The cubic root of 63991002 is about 399.9812532881.

The spelling of 63991002 in words is "sixty-three million, nine hundred ninety-one thousand, two".