81877802 has 16 divisors (see below), whose sum is σ = 129458400. Its totient is φ = 38730960.

The previous prime is 81877793. The next prime is 81877813. The reversal of 81877802 is 20877818.

It is a self number, because there is not a number n which added to its sum of digits gives 81877802.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48224 + ... + 49892.

It is an arithmetic number, because the mean of its divisors is an integer number (8091150).

Almost surely, 2^81877802 is an apocalyptic number.

81877802 is a deficient number, since it is larger than the sum of its proper divisors (47580598).

81877802 is a wasteful number, since it uses less digits than its factorization.

81877802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2981.

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 81877802 is about 9048.6353667280. The cubic root of 81877802 is about 434.2322335851.

The spelling of 81877802 in words is "eighty-one million, eight hundred seventy-seven thousand, eight hundred two".