31640462642 has 16 divisors (see below), whose sum is σ = 47737976832. Its totient is φ = 15728070720.

The previous prime is 31640462629. The next prime is 31640462657. The reversal of 31640462642 is 24626404613.

It is a super-2 number, since 2×31640462642² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31640462596 and 31640462605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171818 + ... + 304634.

It is an arithmetic number, because the mean of its divisors is an integer number (2983623552).

Almost surely, 2^31640462642 is an apocalyptic number.

31640462642 is a deficient number, since it is larger than the sum of its proper divisors (16097514190).

31640462642 is a wasteful number, since it uses less digits than its factorization.

31640462642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133513.

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 31640462642 in words is "thirty-one billion, six hundred forty million, four hundred sixty-two thousand, six hundred forty-two".