63091988 has 6 divisors (see below), whose sum is σ = 110410986. Its totient is φ = 31545992.

The previous prime is 63091979. The next prime is 63092009. The reversal of 63091988 is 88919036.

It can be written as a sum of positive squares in only one way, i.e., 59413264 + 3678724 = 7708^2 + 1918^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7886495 + ... + 7886502.

It is an arithmetic number, because the mean of its divisors is an integer number (18401831).

Almost surely, 2^63091988 is an apocalyptic number.

It is an amenable number.

63091988 is a deficient number, since it is larger than the sum of its proper divisors (47318998).

63091988 is a wasteful number, since it uses less digits than its factorization.

63091988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15773001 (or 15772999 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 63091988 is about 7943.0465188113. The cubic root of 63091988 is about 398.0992909012.

The spelling of 63091988 in words is "sixty-three million, ninety-one thousand, nine hundred eighty-eight".