82721802 has 16 divisors (see below), whose sum is σ = 165608352. Its totient is φ = 27546480.

The previous prime is 82721797. The next prime is 82721843. The reversal of 82721802 is 20812728.

It is a happy number.

It is a super-2 number, since 2×82721802² = 13685793052254408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82721802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228 + ... + 12864.

It is an arithmetic number, because the mean of its divisors is an integer number (10350522).

Almost surely, 2^82721802 is an apocalyptic number.

82721802 is an abundant number, since it is smaller than the sum of its proper divisors (82886550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82721802 is a wasteful number, since it uses less digits than its factorization.

82721802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13733.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 82721802 is about 9095.1526650189. The cubic root of 82721802 is about 435.7191644608.

The spelling of 82721802 in words is "eighty-two million, seven hundred twenty-one thousand, eight hundred two".