81080402 has 16 divisors (see below), whose sum is σ = 131133912. Its totient is φ = 37376640.

The previous prime is 81080401. The next prime is 81080423. The reversal of 81080402 is 20408018.

It can be written as a sum of positive squares in 4 ways, for example, as 36711481 + 44368921 = 6059^2 + 6661^2 .

It is not an unprimeable number, because it can be changed into a prime (81080401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30902 + ... + 33422.

Almost surely, 2^81080402 is an apocalyptic number.

81080402 is a deficient number, since it is larger than the sum of its proper divisors (50053510).

81080402 is a wasteful number, since it uses less digits than its factorization.

81080402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 81080402 is about 9004.4656698774. The cubic root of 81080402 is about 432.8179839357.

The spelling of 81080402 in words is "eighty-one million, eighty thousand, four hundred two".