81413402 has 24 divisors (see below), whose sum is σ = 142813044. Its totient is φ = 34706112.

The previous prime is 81413377. The next prime is 81413407. The reversal of 81413402 is 20431418.

It can be written as a sum of positive squares in 2 ways, for example, as 59613841 + 21799561 = 7721^2 + 4669^2 .

It is not an unprimeable number, because it can be changed into a prime (81413407) 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, 17198 + ... + 21414.

Almost surely, 2^81413402 is an apocalyptic number.

81413402 is a deficient number, since it is larger than the sum of its proper divisors (61399642).

81413402 is a wasteful number, since it uses less digits than its factorization.

81413402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430 (or 4423 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 81413402 is about 9022.9375482711. The cubic root of 81413402 is about 433.4097073800.

The spelling of 81413402 in words is "eighty-one million, four hundred thirteen thousand, four hundred two".