640239009648 has 80 divisors (see below), whose sum is σ = 1896908994816. Its totient is φ = 182279024640.

The previous prime is 640239009637. The next prime is 640239009659. The reversal of 640239009648 is 846900932046.

It is an interprime number because it is at equal distance from previous prime (640239009637) and next prime (640239009659).

It is a self number, because there is not a number n which added to its sum of digits gives 640239009648.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3271473 + ... + 3461648.

Almost surely, 2^640239009648 is an apocalyptic number.

It is an amenable number.

640239009648 is an abundant number, since it is smaller than the sum of its proper divisors (1256669985168).

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

640239009648 is a wasteful number, since it uses less digits than its factorization.

640239009648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733422 (or 6733416 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The spelling of 640239009648 in words is "six hundred forty billion, two hundred thirty-nine million, nine thousand, six hundred forty-eight".