64553631 has 8 divisors (see below), whose sum is σ = 86217600. Its totient is φ = 42962712.

The previous prime is 64553581. The next prime is 64553647. The reversal of 64553631 is 13635546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64553631 - 2⁹ = 64553119 is a prime.

It is a super-2 number, since 2×64553631² = 8334342550568322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64553592 and 64553601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64554631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16165 + ... + 19758.

It is an arithmetic number, because the mean of its divisors is an integer number (10777200).

Almost surely, 2^64553631 is an apocalyptic number.

64553631 is a deficient number, since it is larger than the sum of its proper divisors (21663969).

64553631 is a wasteful number, since it uses less digits than its factorization.

64553631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36525.

The product of its digits is 32400, while the sum is 33.

The square root of 64553631 is about 8034.5274285424. The cubic root of 64553631 is about 401.1500879915.

The spelling of 64553631 in words is "sixty-four million, five hundred fifty-three thousand, six hundred thirty-one".