637400700040 has 128 divisors (see below), whose sum is σ = 1553788293120. Its totient is φ = 233930188800.

The previous prime is 637400700031. The next prime is 637400700061. The reversal of 637400700040 is 40007004736.

It is a super-2 number, since 2×637400700040² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 637400699975 and 637400700011.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 229527132 + ... + 229529908.

It is an arithmetic number, because the mean of its divisors is an integer number (12138971040).

Almost surely, 2^637400700040 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 637400700040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776894146560).

637400700040 is an abundant number, since it is smaller than the sum of its proper divisors (916387593080).

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

637400700040 is a wasteful number, since it uses less digits than its factorization.

637400700040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303 (or 5299 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 31.

Adding to 637400700040 its reverse (40007004736), we get a palindrome (677407704776).

The spelling of 637400700040 in words is "six hundred thirty-seven billion, four hundred million, seven hundred thousand, forty".