64640373 has 16 divisors (see below), whose sum is σ = 102782976. Its totient is φ = 35331120.

The previous prime is 64640357. The next prime is 64640393. The reversal of 64640373 is 37304646.

It is not a de Polignac number, because 64640373 - 2⁴ = 64640357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66433 + ... + 67398.

It is an arithmetic number, because the mean of its divisors is an integer number (6423936).

Almost surely, 2^64640373 is an apocalyptic number.

It is an amenable number.

64640373 is a deficient number, since it is larger than the sum of its proper divisors (38142603).

64640373 is a wasteful number, since it uses less digits than its factorization.

64640373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133864.

The product of its (nonzero) digits is 36288, while the sum is 33.

The square root of 64640373 is about 8039.9236936677. The cubic root of 64640373 is about 401.3296853609.

The spelling of 64640373 in words is "sixty-four million, six hundred forty thousand, three hundred seventy-three".