640280480 has 48 divisors (see below), whose sum is σ = 1728760320. Its totient is φ = 219524352.

The previous prime is 640280467. The next prime is 640280489. The reversal of 640280480 is 84082046.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (640280489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284720 + ... + 286959.

It is an arithmetic number, because the mean of its divisors is an integer number (36015840).

Almost surely, 2^640280480 is an apocalyptic number.

It is an amenable number.

640280480 is an abundant number, since it is smaller than the sum of its proper divisors (1088479840).

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

640280480 is a wasteful number, since it uses less digits than its factorization.

640280480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571701 (or 571693 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 640280480 is about 25303.7641468616. The cubic root of 640280480 is about 861.8997484271.

The spelling of 640280480 in words is "six hundred forty million, two hundred eighty thousand, four hundred eighty".