64646739 has 6 divisors (see below), whose sum is σ = 93378636. Its totient is φ = 43097820.

The previous prime is 64646689. The next prime is 64646741. The reversal of 64646739 is 93764646.

It is not a de Polignac number, because 64646739 - 2¹¹ = 64644691 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64646694 and 64646703.

It is not an unprimeable number, because it can be changed into a prime (64646789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3591477 + ... + 3591494.

It is an arithmetic number, because the mean of its divisors is an integer number (15563106).

Almost surely, 2^64646739 is an apocalyptic number.

64646739 is a deficient number, since it is larger than the sum of its proper divisors (28731897).

64646739 is a wasteful number, since it uses less digits than its factorization.

64646739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7182977 (or 7182974 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The square root of 64646739 is about 8040.3195832007. The cubic root of 64646739 is about 401.3428596914.

It can be divided in two parts, 6464 and 6739, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 64646739 in words is "sixty-four million, six hundred forty-six thousand, seven hundred thirty-nine".