81425088 has 140 divisors (see below), whose sum is σ = 245257320. Its totient is φ = 26707968.

The previous prime is 81425081. The next prime is 81425159. The reversal of 81425088 is 88052418.

81425088 is a `hidden beast` number, since 8 + 142 + 508 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81425081) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 585723 + ... + 585861.

It is an arithmetic number, because the mean of its divisors is an integer number (1751838).

Almost surely, 2^81425088 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 81425088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122628660).

81425088 is an abundant number, since it is smaller than the sum of its proper divisors (163832232).

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

81425088 is a wasteful number, since it uses less digits than its factorization.

81425088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 81425088 is about 9023.5850968448. The cubic root of 81425088 is about 433.4304434562.

The spelling of 81425088 in words is "eighty-one million, four hundred twenty-five thousand, eighty-eight".