81292446 has 48 divisors (see below), whose sum is σ = 181868544. Its totient is φ = 26227152.

The previous prime is 81292439. The next prime is 81292483. The reversal of 81292446 is 64429218.

It is a self number, because there is not a number n which added to its sum of digits gives 81292446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97885 + ... + 98711.

It is an arithmetic number, because the mean of its divisors is an integer number (3788928).

Almost surely, 2^81292446 is an apocalyptic number.

81292446 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

81292446 is an abundant number, since it is smaller than the sum of its proper divisors (100576098).

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

81292446 is a wasteful number, since it uses less digits than its factorization.

81292446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005 (or 1002 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 81292446 is about 9016.2323616908. The cubic root of 81292446 is about 433.1949618688.

The spelling of 81292446 in words is "eighty-one million, two hundred ninety-two thousand, four hundred forty-six".