81406892 has 12 divisors (see below), whose sum is σ = 162813840. Its totient is φ = 34888656.

The previous prime is 81406889. The next prime is 81406903. The reversal of 81406892 is 29860418.

81406892 is an admirable 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, 1453667 + ... + 1453722.

It is an arithmetic number, because the mean of its divisors is an integer number (13567820).

Almost surely, 2^81406892 is an apocalyptic number.

It is an amenable number.

81406892 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81406892 is a wasteful number, since it uses less digits than its factorization.

81406892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907400 (or 2907398 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 81406892 is about 9022.5767937990. The cubic root of 81406892 is about 433.3981549315.

The spelling of 81406892 in words is "eighty-one million, four hundred six thousand, eight hundred ninety-two".