68297631940 has 24 divisors (see below), whose sum is σ = 143431491672. Its totient is φ = 27317821440.

The previous prime is 68297631889. The next prime is 68297631943. The reversal of 68297631940 is 4913679286.

It can be written as a sum of positive squares in 4 ways, for example, as 5404014144 + 62893617796 = 73512^2 + 250786^2 .

It is a super-2 number, since 2×68297631940² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68297631943) 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, 474102 + ... + 601138.

It is an arithmetic number, because the mean of its divisors is an integer number (5976312153).

Almost surely, 2^68297631940 is an apocalyptic number.

It is an amenable number.

68297631940 is an abundant number, since it is smaller than the sum of its proper divisors (75133859732).

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

68297631940 is a wasteful number, since it uses less digits than its factorization.

68297631940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153927 (or 153925 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The spelling of 68297631940 in words is "sixty-eight billion, two hundred ninety-seven million, six hundred thirty-one thousand, nine hundred forty".