31720339287 has 360 divisors, whose sum is σ = 66608798256. Its totient is φ = 14850791424.

The previous prime is 31720339247. The next prime is 31720339289. The reversal of 31720339287 is 78293302713.

31720339287 is a `hidden beast` number, since 3 + 17 + 20 + 339 + 287 = 666.

It is not a de Polignac number, because 31720339287 - 2⁸ = 31720339031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31720339289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 737682288 + ... + 737682330.

Almost surely, 2^31720339287 is an apocalyptic number.

31720339287 is an abundant number, since it is smaller than the sum of its proper divisors (34888458969).

31720339287 is a wasteful number, since it uses less digits than its factorization.

31720339287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The spelling of 31720339287 in words is "thirty-one billion, seven hundred twenty million, three hundred thirty-nine thousand, two hundred eighty-seven".