640772748 has 192 divisors, whose sum is σ = 2143411200. Its totient is φ = 160634880.

The previous prime is 640772707. The next prime is 640772749. The reversal of 640772748 is 847277046.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (640772749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 239836 + ... + 242492.

It is an arithmetic number, because the mean of its divisors is an integer number (11163600).

Almost surely, 2^640772748 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 640772748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071705600).

640772748 is an abundant number, since it is smaller than the sum of its proper divisors (1502638452).

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

640772748 is a wasteful number, since it uses less digits than its factorization.

640772748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717 (or 2709 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 45.

The square root of 640772748 is about 25313.4894473283. The cubic root of 640772748 is about 862.1205771577.

The spelling of 640772748 in words is "six hundred forty million, seven hundred seventy-two thousand, seven hundred forty-eight".