81924029 has 16 divisors (see below), whose sum is σ = 95031360. Its totient is φ = 69840000.

The previous prime is 81924001. The next prime is 81924047. The reversal of 81924029 is 92042918.

It is a cyclic number.

It is not a de Polignac number, because 81924029 - 2²⁴ = 65146813 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81924029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81924079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19169 + ... + 23049.

It is an arithmetic number, because the mean of its divisors is an integer number (5939460).

Almost surely, 2^81924029 is an apocalyptic number.

It is an amenable number.

81924029 is a deficient number, since it is larger than the sum of its proper divisors (13107331).

81924029 is a wasteful number, since it uses less digits than its factorization.

81924029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 81924029 is about 9051.1893693591. The cubic root of 81924029 is about 434.3139385831.

It can be divided in two parts, 8192 and 4029, that added together give a palindrome (12221).

The spelling of 81924029 in words is "eighty-one million, nine hundred twenty-four thousand, twenty-nine".