64628623 has 2 divisors, whose sum is σ = 64628624. Its totient is φ = 64628622.

The previous prime is 64628621. The next prime is 64628647. The reversal of 64628623 is 32682646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64628623 - 2¹ = 64628621 is a prime.

It is a super-2 number, since 2×64628623² = 8353717821752258, which contains 22 as substring.

Together with 64628621, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64628621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32314311 + 32314312.

It is an arithmetic number, because the mean of its divisors is an integer number (32314312).

Almost surely, 2^64628623 is an apocalyptic number.

64628623 is a deficient number, since it is larger than the sum of its proper divisors (1).

64628623 is an equidigital number, since it uses as much as digits as its factorization.

64628623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 37.

The square root of 64628623 is about 8039.1929321294. The cubic root of 64628623 is about 401.3053666607.

The spelling of 64628623 in words is "sixty-four million, six hundred twenty-eight thousand, six hundred twenty-three".