63687813 has 16 divisors (see below), whose sum is σ = 97173120. Its totient is φ = 36346176.

The previous prime is 63687803. The next prime is 63687823. The reversal of 63687813 is 31878636.

It is an interprime number because it is at equal distance from previous prime (63687803) and next prime (63687823).

It is not a de Polignac number, because 63687813 - 2⁶ = 63687749 is a prime.

It is a super-2 number, since 2×63687813² = 8112275049445938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63687803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21031 + ... + 23867.

It is an arithmetic number, because the mean of its divisors is an integer number (6073320).

Almost surely, 2^63687813 is an apocalyptic number.

It is an amenable number.

63687813 is a deficient number, since it is larger than the sum of its proper divisors (33485307).

63687813 is a wasteful number, since it uses less digits than its factorization.

63687813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3916.

The product of its digits is 145152, while the sum is 42.

The square root of 63687813 is about 7980.4644601677. The cubic root of 63687813 is about 399.3485500250.

The spelling of 63687813 in words is "sixty-three million, six hundred eighty-seven thousand, eight hundred thirteen".