81772429 has 8 divisors (see below), whose sum is σ = 85825152. Its totient is φ = 77761200.

The previous prime is 81772393. The next prime is 81772463. The reversal of 81772429 is 92427718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81772429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81772391 and 81772400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81772129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6297 + ... + 14254.

It is an arithmetic number, because the mean of its divisors is an integer number (10728144).

Almost surely, 2^81772429 is an apocalyptic number.

It is an amenable number.

81772429 is a deficient number, since it is larger than the sum of its proper divisors (4052723).

81772429 is a wasteful number, since it uses less digits than its factorization.

81772429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20747.

The product of its digits is 56448, while the sum is 40.

The square root of 81772429 is about 9042.8109014841. The cubic root of 81772429 is about 434.0458745848.

The spelling of 81772429 in words is "eighty-one million, seven hundred seventy-two thousand, four hundred twenty-nine".