81902885 has 8 divisors (see below), whose sum is σ = 102556800. Its totient is φ = 62673424.

The previous prime is 81902881. The next prime is 81902893. The reversal of 81902885 is 58820918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81902885 - 2² = 81902881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81902881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355985 + ... + 356214.

It is an arithmetic number, because the mean of its divisors is an integer number (12819600).

Almost surely, 2^81902885 is an apocalyptic number.

It is an amenable number.

81902885 is a deficient number, since it is larger than the sum of its proper divisors (20653915).

81902885 is a wasteful number, since it uses less digits than its factorization.

81902885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712227.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 81902885 is about 9050.0212706932. The cubic root of 81902885 is about 434.2765709382.

The spelling of 81902885 in words is "eighty-one million, nine hundred two thousand, eight hundred eighty-five".