82729421 has 8 divisors (see below), whose sum is σ = 85682688. Its totient is φ = 79794000.

The previous prime is 82729379. The next prime is 82729441. The reversal of 82729421 is 12492728.

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

It is not a de Polignac number, because 82729421 - 2²² = 78535117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82729441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5351 + ... + 13931.

It is an arithmetic number, because the mean of its divisors is an integer number (10710336).

Almost surely, 2^82729421 is an apocalyptic number.

It is an amenable number.

82729421 is a deficient number, since it is larger than the sum of its proper divisors (2953267).

82729421 is a wasteful number, since it uses less digits than its factorization.

82729421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8923.

The product of its digits is 16128, while the sum is 35.

The square root of 82729421 is about 9095.5715048588. The cubic root of 82729421 is about 435.7325411939.

The spelling of 82729421 in words is "eighty-two million, seven hundred twenty-nine thousand, four hundred twenty-one".