82715421 has 8 divisors (see below), whose sum is σ = 116774784. Its totient is φ = 51899840.

The previous prime is 82715407. The next prime is 82715447. The reversal of 82715421 is 12451728.

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

It is a cyclic number.

It is not a de Polignac number, because 82715421 - 2⁶ = 82715357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82715401) 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, 810885 + ... + 810986.

It is an arithmetic number, because the mean of its divisors is an integer number (14596848).

Almost surely, 2^82715421 is an apocalyptic number.

It is an amenable number.

82715421 is a deficient number, since it is larger than the sum of its proper divisors (34059363).

82715421 is a wasteful number, since it uses less digits than its factorization.

82715421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621891.

The product of its digits is 4480, while the sum is 30.

The square root of 82715421 is about 9094.8018670007. The cubic root of 82715421 is about 435.7079606612.

The spelling of 82715421 in words is "eighty-two million, seven hundred fifteen thousand, four hundred twenty-one".