64707640 has 16 divisors (see below), whose sum is σ = 145592280. Its totient is φ = 25883040.

The previous prime is 64707619. The next prime is 64707649. The reversal of 64707640 is 4670746.

It is a junction number, because it is equal to n+sod(n) for n = 64707596 and 64707605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64707649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808806 + ... + 808885.

Almost surely, 2^64707640 is an apocalyptic number.

It is an amenable number.

64707640 is an abundant number, since it is smaller than the sum of its proper divisors (80884640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64707640 is a wasteful number, since it uses less digits than its factorization.

64707640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617702 (or 1617698 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 64707640 is about 8044.1059167567. The cubic root of 64707640 is about 401.4688495999.

The spelling of 64707640 in words is "sixty-four million, seven hundred seven thousand, six hundred forty".