654900640 has 24 divisors (see below), whose sum is σ = 1547203140. Its totient is φ = 261960192.

The previous prime is 654900583. The next prime is 654900671. The reversal of 654900640 is 46009456.

It can be written as a sum of positive squares in 2 ways, for example, as 646583184 + 8317456 = 25428^2 + 2884^2 .

It is a junction number, because it is equal to n+sod(n) for n = 654900596 and 654900605.

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, 2046405 + ... + 2046724.

Almost surely, 2^654900640 is an apocalyptic number.

It is an amenable number.

654900640 is an abundant number, since it is smaller than the sum of its proper divisors (892302500).

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

654900640 is a wasteful number, since it uses less digits than its factorization.

654900640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4093144 (or 4093136 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 654900640 is about 25591.0265522898. The cubic root of 654900640 is about 868.4106447457.

The spelling of 654900640 in words is "six hundred fifty-four million, nine hundred thousand, six hundred forty".