81795402 has 24 divisors (see below), whose sum is σ = 190856484. Its totient is φ = 25167744.

The previous prime is 81795379. The next prime is 81795403. The reversal of 81795402 is 20459718.

It can be written as a sum of positive squares in 2 ways, for example, as 75846681 + 5948721 = 8709^2 + 2439^2 .

It is not an unprimeable number, because it can be changed into a prime (81795403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174543 + ... + 175010.

Almost surely, 2^81795402 is an apocalyptic number.

81795402 is an abundant number, since it is smaller than the sum of its proper divisors (109061082).

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

81795402 is a wasteful number, since it uses less digits than its factorization.

81795402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349574 (or 349571 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 81795402 is about 9044.0810478456. The cubic root of 81795402 is about 434.0865174696.

The spelling of 81795402 in words is "eighty-one million, seven hundred ninety-five thousand, four hundred two".