63977990 has 16 divisors (see below), whose sum is σ = 115251552. Its totient is φ = 25570944.

The previous prime is 63977981. The next prime is 63977993. The reversal of 63977990 is 9977936.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63977993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22847 + ... + 25493.

It is an arithmetic number, because the mean of its divisors is an integer number (7203222).

Almost surely, 2^63977990 is an apocalyptic number.

63977990 is a deficient number, since it is larger than the sum of its proper divisors (51273562).

63977990 is a wasteful number, since it uses less digits than its factorization.

63977990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5071.

The product of its (nonzero) digits is 642978, while the sum is 50.

The square root of 63977990 is about 7998.6242567081. The cubic root of 63977990 is about 399.9541405758.

The spelling of 63977990 in words is "sixty-three million, nine hundred seventy-seven thousand, nine hundred ninety".