64628939 has 2 divisors, whose sum is σ = 64628940. Its totient is φ = 64628938.

The previous prime is 64628897. The next prime is 64628947. The reversal of 64628939 is 93982646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64628939 - 2¹² = 64624843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64628893 and 64628902.

It is not a weakly prime, because it can be changed into another prime (64628959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32314469 + 32314470.

It is an arithmetic number, because the mean of its divisors is an integer number (32314470).

Almost surely, 2^64628939 is an apocalyptic number.

64628939 is a deficient number, since it is larger than the sum of its proper divisors (1).

64628939 is an equidigital number, since it uses as much as digits as its factorization.

64628939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 47.

The square root of 64628939 is about 8039.2125858196. The cubic root of 64628939 is about 401.3060207171.

The spelling of 64628939 in words is "sixty-four million, six hundred twenty-eight thousand, nine hundred thirty-nine".