81894902 has 8 divisors (see below), whose sum is σ = 129307800. Its totient is φ = 38792304.

The previous prime is 81894893. The next prime is 81894937. The reversal of 81894902 is 20949818.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81894902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077527 + ... + 1077602.

It is an arithmetic number, because the mean of its divisors is an integer number (16163475).

Almost surely, 2^81894902 is an apocalyptic number.

81894902 is a deficient number, since it is larger than the sum of its proper divisors (47412898).

81894902 is a wasteful number, since it uses less digits than its factorization.

81894902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2155150.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 81894902 is about 9049.5802112584. The cubic root of 81894902 is about 434.2624609652.

The spelling of 81894902 in words is "eighty-one million, eight hundred ninety-four thousand, nine hundred two".