654372640 has 24 divisors (see below), whose sum is σ = 1545955740. Its totient is φ = 261748992.

The previous prime is 654372623. The next prime is 654372643. The reversal of 654372640 is 46273456.

It can be written as a sum of positive squares in 2 ways, for example, as 625600144 + 28772496 = 25012^2 + 5364^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 654372640.

It is not an unprimeable number, because it can be changed into a prime (654372643) 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, 2044755 + ... + 2045074.

Almost surely, 2^654372640 is an apocalyptic number.

It is an amenable number.

654372640 is an abundant number, since it is smaller than the sum of its proper divisors (891583100).

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

654372640 is a wasteful number, since it uses less digits than its factorization.

654372640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089844 (or 4089836 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 37.

The square root of 654372640 is about 25580.7083561030. The cubic root of 654372640 is about 868.1772026671.

The spelling of 654372640 in words is "six hundred fifty-four million, three hundred seventy-two thousand, six hundred forty".