634772781272 has 64 divisors (see below), whose sum is σ = 1412634981120. Its totient is φ = 261752819328.

The previous prime is 634772781169. The next prime is 634772781287. The reversal of 634772781272 is 272187277436.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1805903 + ... + 2128574.

It is an arithmetic number, because the mean of its divisors is an integer number (22072421580).

Almost surely, 2^634772781272 is an apocalyptic number.

It is an amenable number.

634772781272 is an abundant number, since it is smaller than the sum of its proper divisors (777862199848).

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

634772781272 is a wasteful number, since it uses less digits than its factorization.

634772781272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934600 (or 3934596 counting only the distinct ones).

The product of its digits is 11063808, while the sum is 56.

The spelling of 634772781272 in words is "six hundred thirty-four billion, seven hundred seventy-two million, seven hundred eighty-one thousand, two hundred seventy-two".