97310631640 has 64 divisors (see below), whose sum is σ = 225123948000. Its totient is φ = 37833538560.

The previous prime is 97310631611. The next prime is 97310631653. The reversal of 97310631640 is 4613601379.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 97310631593 and 97310631602.

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 15 ways as a sum of consecutive naturals, for example, 330871 + ... + 551449.

Almost surely, 2^97310631640 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 97310631640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112561974000).

97310631640 is an abundant number, since it is smaller than the sum of its proper divisors (127813316360).

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

97310631640 is a wasteful number, since it uses less digits than its factorization.

97310631640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220900 (or 220896 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 97310631640 in words is "ninety-seven billion, three hundred ten million, six hundred thirty-one thousand, six hundred forty".