31878743700 has 72 divisors (see below), whose sum is σ = 92854994400. Its totient is φ = 8443932800.

The previous prime is 31878743669. The next prime is 31878743713. The reversal of 31878743700 is 734787813.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31878743700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 311886 + ... + 401285.

It is an arithmetic number, because the mean of its divisors is an integer number (1289652700).

Almost surely, 2^31878743700 is an apocalyptic number.

31878743700 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31878743700 is an abundant number, since it is smaller than the sum of its proper divisors (60976250700).

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

31878743700 is a wasteful number, since it uses less digits than its factorization.

31878743700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713337 (or 713330 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 48.

The spelling of 31878743700 in words is "thirty-one billion, eight hundred seventy-eight million, seven hundred forty-three thousand, seven hundred".