81402176 has 28 divisors (see below), whose sum is σ = 163055808. Its totient is φ = 40317312.

The previous prime is 81402163. The next prime is 81402203. The reversal of 81402176 is 67120418.

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, 905 + ... + 12791.

Almost surely, 2^81402176 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81402176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81527904).

81402176 is an abundant number, since it is smaller than the sum of its proper divisors (81653632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81402176 is a wasteful number, since it uses less digits than its factorization.

81402176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12006 (or 11996 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 81402176 is about 9022.3154456049. The cubic root of 81402176 is about 433.3897856763.

The spelling of 81402176 in words is "eighty-one million, four hundred two thousand, one hundred seventy-six".