64440670 has 32 divisors (see below), whose sum is σ = 133265088. Its totient is φ = 21977088.

The previous prime is 64440653. The next prime is 64440671. The reversal of 64440670 is 7604446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440671) 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, 11454 + ... + 16126.

It is an arithmetic number, because the mean of its divisors is an integer number (4164534).

Almost surely, 2^64440670 is an apocalyptic number.

64440670 is an abundant number, since it is smaller than the sum of its proper divisors (68824418).

64440670 is a wasteful number, since it uses less digits than its factorization.

64440670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 64440670 is about 8027.4946278400. The cubic root of 64440670 is about 400.9159634265.

It can be divided in two parts, 644 and 40670, that added together give a palindrome (41314).

The spelling of 64440670 in words is "sixty-four million, four hundred forty thousand, six hundred seventy".