640962480 has 40 divisors (see below), whose sum is σ = 1986984432. Its totient is φ = 170923264.

The previous prime is 640962467. The next prime is 640962481. The reversal of 640962480 is 84269046.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (640962481) 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, 1335099 + ... + 1335578.

Almost surely, 2^640962480 is an apocalyptic number.

640962480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

640962480 is an abundant number, since it is smaller than the sum of its proper divisors (1346021952).

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

640962480 is a wasteful number, since it uses less digits than its factorization.

640962480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670693 (or 2670687 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 640962480 is about 25317.2368160508. The cubic root of 640962480 is about 862.2056596981.

The spelling of 640962480 in words is "six hundred forty million, nine hundred sixty-two thousand, four hundred eighty".