81029592 has 64 divisors (see below), whose sum is σ = 257241600. Its totient is φ = 23150880.

The previous prime is 81029581. The next prime is 81029603. The reversal of 81029592 is 29592018.

It is an interprime number because it is at equal distance from previous prime (81029581) and next prime (81029603).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25284 + ... + 28307.

It is an arithmetic number, because the mean of its divisors is an integer number (4019400).

Almost surely, 2^81029592 is an apocalyptic number.

It is an amenable number.

81029592 is an abundant number, since it is smaller than the sum of its proper divisors (176212008).

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

81029592 is a wasteful number, since it uses less digits than its factorization.

81029592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53613 (or 53603 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 81029592 is about 9001.6438498754. The cubic root of 81029592 is about 432.7275548613.

The spelling of 81029592 in words is "eighty-one million, twenty-nine thousand, five hundred ninety-two".