64644677 has 2 divisors, whose sum is σ = 64644678. Its totient is φ = 64644676.

The previous prime is 64644649. The next prime is 64644691. The reversal of 64644677 is 77644646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48636676 + 16008001 = 6974^2 + 4001^2 .

It is a cyclic number.

It is not a de Polignac number, because 64644677 - 2¹² = 64640581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64644617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322338 + 32322339.

It is an arithmetic number, because the mean of its divisors is an integer number (32322339).

Almost surely, 2^64644677 is an apocalyptic number.

It is an amenable number.

64644677 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644677 is an equidigital number, since it uses as much as digits as its factorization.

64644677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 44.

The square root of 64644677 is about 8040.1913534443. The cubic root of 64644677 is about 401.3385925116.

The spelling of 64644677 in words is "sixty-four million, six hundred forty-four thousand, six hundred seventy-seven".