63679631 has 4 divisors (see below), whose sum is σ = 63817632. Its totient is φ = 63541632.

The previous prime is 63679619. The next prime is 63679667. The reversal of 63679631 is 13697636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63679631 - 2¹⁴ = 63663247 is a prime.

It is a super-2 number, since 2×63679631² = 8110190808592322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63679691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68306 + ... + 69231.

It is an arithmetic number, because the mean of its divisors is an integer number (15954408).

Almost surely, 2^63679631 is an apocalyptic number.

63679631 is a deficient number, since it is larger than the sum of its proper divisors (138001).

63679631 is a wasteful number, since it uses less digits than its factorization.

63679631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138000.

The product of its digits is 122472, while the sum is 41.

The square root of 63679631 is about 7979.9518168971. The cubic root of 63679631 is about 399.3314478008.

The spelling of 63679631 in words is "sixty-three million, six hundred seventy-nine thousand, six hundred thirty-one".