63920731 has 24 divisors (see below), whose sum is σ = 81735680. Its totient is φ = 48822912.

The previous prime is 63920723. The next prime is 63920819. The reversal of 63920731 is 13702936.

It is not a de Polignac number, because 63920731 - 2³ = 63920723 is a prime.

It is a super-2 number, since 2×63920731² = 8171719703148722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63920693 and 63920702.

It is not an unprimeable number, because it can be changed into a prime (63920711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37606 + ... + 39268.

Almost surely, 2^63920731 is an apocalyptic number.

63920731 is a deficient number, since it is larger than the sum of its proper divisors (17814949).

63920731 is a wasteful number, since it uses less digits than its factorization.

63920731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1723 (or 1706 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 63920731 is about 7995.0441524735. The cubic root of 63920731 is about 399.8347880219.

The spelling of 63920731 in words is "sixty-three million, nine hundred twenty thousand, seven hundred thirty-one".