81925992 has 192 divisors, whose sum is σ = 253955520. Its totient is φ = 24634368.

The previous prime is 81925979. The next prime is 81925993. The reversal of 81925992 is 29952918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81925993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1222743 + ... + 1222809.

It is an arithmetic number, because the mean of its divisors is an integer number (1322685).

Almost surely, 2^81925992 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 81925992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126977760).

81925992 is an abundant number, since it is smaller than the sum of its proper divisors (172029528).

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

81925992 is a wasteful number, since it uses less digits than its factorization.

81925992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 126 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 81925992 is about 9051.2978074970. The cubic root of 81925992 is about 434.3174074532.

The spelling of 81925992 in words is "eighty-one million, nine hundred twenty-five thousand, nine hundred ninety-two".