31689777048 has 128 divisors (see below), whose sum is σ = 81380920320. Its totient is φ = 10280632320.

The previous prime is 31689777047. The next prime is 31689777071. The reversal of 31689777048 is 84077798613.

It is a super-3 number, since 3×31689777048³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31689776982 and 31689777000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31689777043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54921336 + ... + 54921912.

It is an arithmetic number, because the mean of its divisors is an integer number (635788440).

Almost surely, 2^31689777048 is an apocalyptic number.

It is an amenable number.

31689777048 is an abundant number, since it is smaller than the sum of its proper divisors (49691143272).

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

31689777048 is a wasteful number, since it uses less digits than its factorization.

31689777048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 60.

The spelling of 31689777048 in words is "thirty-one billion, six hundred eighty-nine million, seven hundred seventy-seven thousand, forty-eight".