64374640 has 80 divisors (see below), whose sum is σ = 164560896. Its totient is φ = 23225600.

The previous prime is 64374619. The next prime is 64374647. The reversal of 64374640 is 4647346.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64374596 and 64374605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64374647) 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, 167889 + ... + 168271.

Almost surely, 2^64374640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64374640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82280448).

64374640 is an abundant number, since it is smaller than the sum of its proper divisors (100186256).

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

64374640 is a wasteful number, since it uses less digits than its factorization.

64374640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 64374640 is about 8023.3808335389. The cubic root of 64374640 is about 400.7789819829.

The spelling of 64374640 in words is "sixty-four million, three hundred seventy-four thousand, six hundred forty".