654945640 has 16 divisors (see below), whose sum is σ = 1473627780. Its totient is φ = 261978240.

The previous prime is 654945617. The next prime is 654945653. The reversal of 654945640 is 46549456.

It can be written as a sum of positive squares in 2 ways, for example, as 615933124 + 39012516 = 24818^2 + 6246^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8186781 + ... + 8186860.

Almost surely, 2^654945640 is an apocalyptic number.

It is an amenable number.

654945640 is an abundant number, since it is smaller than the sum of its proper divisors (818682140).

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

654945640 is a wasteful number, since it uses less digits than its factorization.

654945640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16373652 (or 16373648 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 654945640 is about 25591.9057516239. The cubic root of 654945640 is about 868.4305345740.

The spelling of 654945640 in words is "six hundred fifty-four million, nine hundred forty-five thousand, six hundred forty".