637271916 has 12 divisors (see below), whose sum is σ = 1486967832. Its totient is φ = 212423968.

The previous prime is 637271893. The next prime is 637271917. The reversal of 637271916 is 619172736.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×637271916² = 812230989844622112, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (637271917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26552985 + ... + 26553008.

It is an arithmetic number, because the mean of its divisors is an integer number (123913986).

Almost surely, 2^637271916 is an apocalyptic number.

It is an amenable number.

637271916 is an abundant number, since it is smaller than the sum of its proper divisors (849695916).

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

637271916 is a wasteful number, since it uses less digits than its factorization.

637271916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53106000 (or 53105998 counting only the distinct ones).

The product of its digits is 95256, while the sum is 42.

The square root of 637271916 is about 25244.2452055909. The cubic root of 637271916 is about 860.5476573013.

The spelling of 637271916 in words is "six hundred thirty-seven million, two hundred seventy-one thousand, nine hundred sixteen".