2640645450 has 36 divisors (see below), whose sum is σ = 7094535318. Its totient is φ = 704172000.

The previous prime is 2640645439. The next prime is 2640645499. The reversal of 2640645450 is 545460462.

2640645450 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 645 + 4 + 5 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1207493001 + 1433152449 = 34749^2 + 37857^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2933601 + ... + 2934500.

Almost surely, 2^2640645450 is an apocalyptic number.

2640645450 is an abundant number, since it is smaller than the sum of its proper divisors (4453889868).

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

2640645450 is a wasteful number, since it uses less digits than its factorization.

2640645450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5868119 (or 5868111 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 2640645450 is about 51387.2109575914. The cubic root of 2640645450 is about 1382.1972714877.

The spelling of 2640645450 in words is "two billion, six hundred forty million, six hundred forty-five thousand, four hundred fifty".