63621967 has 4 divisors (see below), whose sum is σ = 64239760. Its totient is φ = 63004176.

The previous prime is 63621959. The next prime is 63621977. The reversal of 63621967 is 76912636.

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 63621967 - 2³ = 63621959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63621947) 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, 308742 + ... + 308947.

It is an arithmetic number, because the mean of its divisors is an integer number (16059940).

Almost surely, 2^63621967 is an apocalyptic number.

63621967 is a deficient number, since it is larger than the sum of its proper divisors (617793).

63621967 is a wasteful number, since it uses less digits than its factorization.

63621967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617792.

The product of its digits is 81648, while the sum is 40.

The square root of 63621967 is about 7976.3379441947. The cubic root of 63621967 is about 399.2108754800.

The spelling of 63621967 in words is "sixty-three million, six hundred twenty-one thousand, nine hundred sixty-seven".