640796892484 has 144 divisors (see below), whose sum is σ = 1470882333312. Its totient is φ = 238248428544.

The previous prime is 640796892409. The next prime is 640796892497. The reversal of 640796892484 is 484298697046.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6307539 + ... + 6408325.

It is an arithmetic number, because the mean of its divisors is an integer number (10214460648).

Almost surely, 2^640796892484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640796892484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735441166656).

640796892484 is an abundant number, since it is smaller than the sum of its proper divisors (830085440828).

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

640796892484 is a wasteful number, since it uses less digits than its factorization.

640796892484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100890 (or 100869 counting only the distinct ones).

The product of its (nonzero) digits is 167215104, while the sum is 67.

The spelling of 640796892484 in words is "six hundred forty billion, seven hundred ninety-six million, eight hundred ninety-two thousand, four hundred eighty-four".