63621257 has 12 divisors (see below), whose sum is σ = 75116880. Its totient is φ = 53715816.

The previous prime is 63621211. The next prime is 63621277. The reversal of 63621257 is 75212636.

It is not a de Polignac number, because 63621257 - 2⁸ = 63621001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63621277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6407 + ... + 12972.

It is an arithmetic number, because the mean of its divisors is an integer number (6259740).

Almost surely, 2^63621257 is an apocalyptic number.

63621257 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

It is an amenable number.

63621257 is a deficient number, since it is larger than the sum of its proper divisors (11495623).

63621257 is a wasteful number, since it uses less digits than its factorization.

63621257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19460 (or 19453 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 63621257 is about 7976.2934374307. The cubic root of 63621257 is about 399.2093904542.

It can be divided in two parts, 6 and 3621257, that added together give a palindrome (3621263).

The spelling of 63621257 in words is "sixty-three million, six hundred twenty-one thousand, two hundred fifty-seven".