31401072638 has 8 divisors (see below), whose sum is σ = 50724809688. Its totient is φ = 14492802744.

The previous prime is 31401072631. The next prime is 31401072679. The reversal of 31401072638 is 83627010413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31401072598 and 31401072607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31401072631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 603866756 + ... + 603866807.

It is an arithmetic number, because the mean of its divisors is an integer number (6340601211).

Almost surely, 2^31401072638 is an apocalyptic number.

31401072638 is a deficient number, since it is larger than the sum of its proper divisors (19323737050).

31401072638 is a wasteful number, since it uses less digits than its factorization.

31401072638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207733578.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 31401072638 in words is "thirty-one billion, four hundred one million, seventy-two thousand, six hundred thirty-eight".