81164862 has 16 divisors (see below), whose sum is σ = 180366480. Its totient is φ = 27054936.

The previous prime is 81164833. The next prime is 81164873. The reversal of 81164862 is 26846118.

81164862 is a `hidden beast` number, since 8 + 1 + 1 + 648 + 6 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751473 + ... + 751580.

It is an arithmetic number, because the mean of its divisors is an integer number (11272905).

Almost surely, 2^81164862 is an apocalyptic number.

81164862 is an abundant number, since it is smaller than the sum of its proper divisors (99201618).

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

81164862 is a wasteful number, since it uses less digits than its factorization.

81164862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503064 (or 1503058 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 81164862 is about 9009.1543443322. The cubic root of 81164862 is about 432.9682180251.

The spelling of 81164862 in words is "eighty-one million, one hundred sixty-four thousand, eight hundred sixty-two".