640515207276 has 54 divisors (see below), whose sum is σ = 1883419721820. Its totient is φ = 183004344432.

The previous prime is 640515207271. The next prime is 640515207307. The reversal of 640515207276 is 672702515046.

640515207276 is a `hidden beast` number, since 6 + 4 + 0 + 51 + 520 + 7 + 2 + 76 = 666.

It is not an unprimeable number, because it can be changed into a prime (640515207271) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 181550166 + ... + 181553693.

Almost surely, 2^640515207276 is an apocalyptic number.

It is an amenable number.

640515207276 is an abundant number, since it is smaller than the sum of its proper divisors (1242904514544).

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

640515207276 is a wasteful number, since it uses less digits than its factorization.

640515207276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363103883 (or 363103871 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The spelling of 640515207276 in words is "six hundred forty billion, five hundred fifteen million, two hundred seven thousand, two hundred seventy-six".