31400257642 has 32 divisors (see below), whose sum is σ = 51737938560. Its totient is φ = 14204272320.

The previous prime is 31400257633. The next prime is 31400257649. The reversal of 31400257642 is 24675200413.

It is a junction number, because it is equal to n+sod(n) for n = 31400257598 and 31400257607.

It is not an unprimeable number, because it can be changed into a prime (31400257649) 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, 413859 + ... + 483817.

It is an arithmetic number, because the mean of its divisors is an integer number (1616810580).

Almost surely, 2^31400257642 is an apocalyptic number.

31400257642 is a deficient number, since it is larger than the sum of its proper divisors (20337680918).

31400257642 is a wasteful number, since it uses less digits than its factorization.

31400257642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70318.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 31400257642 in words is "thirty-one billion, four hundred million, two hundred fifty-seven thousand, six hundred forty-two".