637891390040 has 32 divisors (see below), whose sum is σ = 1438870916880. Its totient is φ = 254513837952.

The previous prime is 637891390033. The next prime is 637891390051. The reversal of 637891390040 is 40093198736.

It is a super-2 number, since 2×637891390040² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20068862 + ... + 20100621.

Almost surely, 2^637891390040 is an apocalyptic number.

It is an amenable number.

637891390040 is an abundant number, since it is smaller than the sum of its proper divisors (800979526840).

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

637891390040 is a wasteful number, since it uses less digits than its factorization.

637891390040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40169891 (or 40169887 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 637891390040 in words is "six hundred thirty-seven billion, eight hundred ninety-one million, three hundred ninety thousand, forty".