81200892 has 24 divisors (see below), whose sum is σ = 191753856. Its totient is φ = 26740528.

The previous prime is 81200849. The next prime is 81200939. The reversal of 81200892 is 29800218.

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, 39768 + ... + 41759.

It is an arithmetic number, because the mean of its divisors is an integer number (7989744).

Almost surely, 2^81200892 is an apocalyptic number.

It is an amenable number.

81200892 is an abundant number, since it is smaller than the sum of its proper divisors (110552964).

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

81200892 is a wasteful number, since it uses less digits than its factorization.

81200892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81617 (or 81615 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 81200892 is about 9011.1537552080. The cubic root of 81200892 is about 433.0322750434.

The spelling of 81200892 in words is "eighty-one million, two hundred thousand, eight hundred ninety-two".