31216367616 has 96 divisors (see below), whose sum is σ = 95112501120. Its totient is φ = 8918949888.

The previous prime is 31216367599. The next prime is 31216367617. The reversal of 31216367616 is 61676361213.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31216367617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319906 + ... + 405921.

It is an arithmetic number, because the mean of its divisors is an integer number (990755220).

Almost surely, 2^31216367616 is an apocalyptic number.

It is an amenable number.

31216367616 is an abundant number, since it is smaller than the sum of its proper divisors (63896133504).

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

31216367616 is an equidigital number, since it uses as much as digits as its factorization.

31216367616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725859 (or 725839 counting only the distinct ones).

The product of its digits is 163296, while the sum is 42.

The spelling of 31216367616 in words is "thirty-one billion, two hundred sixteen million, three hundred sixty-seven thousand, six hundred sixteen".