81634028630 has 64 divisors (see below), whose sum is σ = 184517706240. Its totient is φ = 25261286400.

The previous prime is 81634028617. The next prime is 81634028647. The reversal of 81634028630 is 3682043618.

It is a happy number.

It is a super-2 number, since 2×81634028630² (a number of 23 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 31 ways as a sum of consecutive naturals, for example, 274331 + ... + 488390.

It is an arithmetic number, because the mean of its divisors is an integer number (2883089160).

Almost surely, 2^81634028630 is an apocalyptic number.

81634028630 is an abundant number, since it is smaller than the sum of its proper divisors (102883677610).

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

81634028630 is a wasteful number, since it uses less digits than its factorization.

81634028630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762885.

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 81634028630 in words is "eighty-one billion, six hundred thirty-four million, twenty-eight thousand, six hundred thirty".