31402320848 has 80 divisors (see below), whose sum is σ = 64910595456. Its totient is φ = 14665728000.

The previous prime is 31402320847. The next prime is 31402320871. The reversal of 31402320848 is 84802320413.

It is a Cunningham number, because it is equal to 177207²-1.

It is a super-2 number, since 2×31402320848² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31402320847) 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, 24099365 + ... + 24100667.

Almost surely, 2^31402320848 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31402320848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32455297728).

31402320848 is an abundant number, since it is smaller than the sum of its proper divisors (33508274608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31402320848 is a wasteful number, since it uses less digits than its factorization.

31402320848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932 (or 1926 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The spelling of 31402320848 in words is "thirty-one billion, four hundred two million, three hundred twenty thousand, eight hundred forty-eight".