82079621 has 16 divisors (see below), whose sum is σ = 94929408. Its totient is φ = 70291200.

The previous prime is 82079611. The next prime is 82079629. The reversal of 82079621 is 12697028.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82079621 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 (82079629) 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, 13076 + ... + 18306.

It is an arithmetic number, because the mean of its divisors is an integer number (5933088).

Almost surely, 2^82079621 is an apocalyptic number.

82079621 is the 5231-st octagonal number.

It is an amenable number.

82079621 is a deficient number, since it is larger than the sum of its proper divisors (12849787).

82079621 is a wasteful number, since it uses less digits than its factorization.

82079621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 82079621 is about 9059.7804057273. The cubic root of 82079621 is about 434.5887177077.

The spelling of 82079621 in words is "eighty-two million, seventy-nine thousand, six hundred twenty-one".