640408481031 has 64 divisors (see below), whose sum is σ = 949622538240. Its totient is φ = 380640960000.

The previous prime is 640408480997. The next prime is 640408481039. The reversal of 640408481031 is 130184804046.

640408481031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640408481031 - 2⁷ = 640408480903 is a prime.

It is a super-2 number, since 2×640408481031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640408481039) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 450040386 + ... + 450041808.

It is an arithmetic number, because the mean of its divisors is an integer number (14837852160).

Almost surely, 2^640408481031 is an apocalyptic number.

640408481031 is a deficient number, since it is larger than the sum of its proper divisors (309214057209).

640408481031 is a wasteful number, since it uses less digits than its factorization.

640408481031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388.

The product of its (nonzero) digits is 73728, while the sum is 39.

The spelling of 640408481031 in words is "six hundred forty billion, four hundred eight million, four hundred eighty-one thousand, thirty-one".