640286031 has 16 divisors (see below), whose sum is σ = 1064371968. Its totient is φ = 332616000.

The previous prime is 640286021. The next prime is 640286047. The reversal of 640286031 is 130682046.

It is not a de Polignac number, because 640286031 - 2¹³ = 640277839 is a prime.

It is a super-2 number, since 2×640286031² = 819932402987465922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640286031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640286021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1385670 + ... + 1386131.

It is an arithmetic number, because the mean of its divisors is an integer number (66523248).

Almost surely, 2^640286031 is an apocalyptic number.

640286031 is a deficient number, since it is larger than the sum of its proper divisors (424085937).

640286031 is a wasteful number, since it uses less digits than its factorization.

640286031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771822.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 640286031 is about 25303.8738338619. The cubic root of 640286031 is about 861.9022392062.

The spelling of 640286031 in words is "six hundred forty million, two hundred eighty-six thousand, thirty-one".