82776621 has 8 divisors (see below), whose sum is σ = 116861184. Its totient is φ = 51938240.

The previous prime is 82776613. The next prime is 82776623. The reversal of 82776621 is 12667728.

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 82776621 - 2³ = 82776613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82776621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82776623) 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, 811485 + ... + 811586.

It is an arithmetic number, because the mean of its divisors is an integer number (14607648).

Almost surely, 2^82776621 is an apocalyptic number.

It is an amenable number.

82776621 is a deficient number, since it is larger than the sum of its proper divisors (34084563).

82776621 is a wasteful number, since it uses less digits than its factorization.

82776621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623091.

The product of its digits is 56448, while the sum is 39.

The square root of 82776621 is about 9098.1658041607. The cubic root of 82776621 is about 435.8153922748.

The spelling of 82776621 in words is "eighty-two million, seven hundred seventy-six thousand, six hundred twenty-one".