64644697 has 12 divisors (see below), whose sum is σ = 73047744. Its totient is φ = 57074160.

The previous prime is 64644691. The next prime is 64644751. The reversal of 64644697 is 79644646.

It is not a de Polignac number, because 64644697 - 2¹¹ = 64642649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64644691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4429 + ... + 12202.

It is an arithmetic number, because the mean of its divisors is an integer number (6087312).

Almost surely, 2^64644697 is an apocalyptic number.

It is an amenable number.

64644697 is a deficient number, since it is larger than the sum of its proper divisors (8403047).

64644697 is a wasteful number, since it uses less digits than its factorization.

64644697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16680 (or 16667 counting only the distinct ones).

The product of its digits is 870912, while the sum is 46.

The square root of 64644697 is about 8040.1925971957. The cubic root of 64644697 is about 401.3386339008.

It can be divided in two parts, 64644 and 697, that added together give a triangular number (65341 = T₃₆₁).

The spelling of 64644697 in words is "sixty-four million, six hundred forty-four thousand, six hundred ninety-seven".