64624961 has 4 divisors (see below), whose sum is σ = 64641072. Its totient is φ = 64608852.

The previous prime is 64624949. The next prime is 64624993. The reversal of 64624961 is 16942646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 64624961 - 2¹⁸ = 64362817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64624921) 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, 3266 + ... + 11828.

It is an arithmetic number, because the mean of its divisors is an integer number (16160268).

Almost surely, 2^64624961 is an apocalyptic number.

It is an amenable number.

64624961 is a deficient number, since it is larger than the sum of its proper divisors (16111).

64624961 is an equidigital number, since it uses as much as digits as its factorization.

64624961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16110.

The product of its digits is 62208, while the sum is 38.

The square root of 64624961 is about 8038.9651697218. The cubic root of 64624961 is about 401.2977869025.

The spelling of 64624961 in words is "sixty-four million, six hundred twenty-four thousand, nine hundred sixty-one".