64740644 has 12 divisors (see below), whose sum is σ = 117203100. Its totient is φ = 31254048.

The previous prime is 64740629. The next prime is 64740661. The reversal of 64740644 is 44604746.

It can be written as a sum of positive squares in 2 ways, for example, as 55204900 + 9535744 = 7430^2 + 3088^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278939 + ... + 279170.

It is an arithmetic number, because the mean of its divisors is an integer number (9766925).

Almost surely, 2^64740644 is an apocalyptic number.

It is an amenable number.

64740644 is a deficient number, since it is larger than the sum of its proper divisors (52462456).

64740644 is a wasteful number, since it uses less digits than its factorization.

64740644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558142 (or 558140 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 64740644 is about 8046.1570951604. The cubic root of 64740644 is about 401.5370941216.

The spelling of 64740644 in words is "sixty-four million, seven hundred forty thousand, six hundred forty-four".