81900602 has 32 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 32540400.

The previous prime is 81900601. The next prime is 81900617. The reversal of 81900602 is 20600918.

It is not an unprimeable number, because it can be changed into a prime (81900601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9227 + ... + 15777.

It is an arithmetic number, because the mean of its divisors is an integer number (4717440).

Almost surely, 2^81900602 is an apocalyptic number.

81900602 is a deficient number, since it is larger than the sum of its proper divisors (69057478).

81900602 is a wasteful number, since it uses less digits than its factorization.

81900602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6626.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 81900602 is about 9049.8951375140. The cubic root of 81900602 is about 434.2725358235.

The spelling of 81900602 in words is "eighty-one million, nine hundred thousand, six hundred two".