81163602 has 36 divisors (see below), whose sum is σ = 190429434. Its totient is φ = 24972480.

The previous prime is 81163597. The next prime is 81163633. The reversal of 81163602 is 20636118.

It can be written as a sum of positive squares in 3 ways, for example, as 12257001 + 68906601 = 3501^2 + 8301^2 .

It is a super-2 number, since 2×81163602² = 13175060579228808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10299 + ... + 16382.

Almost surely, 2^81163602 is an apocalyptic number.

81163602 is an abundant number, since it is smaller than the sum of its proper divisors (109265832).

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

81163602 is a wasteful number, since it uses less digits than its factorization.

81163602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26715 (or 26699 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81163602 is about 9009.0844151889. The cubic root of 81163602 is about 432.9659775532.

The spelling of 81163602 in words is "eighty-one million, one hundred sixty-three thousand, six hundred two".