82724420 has 12 divisors (see below), whose sum is σ = 173721324. Its totient is φ = 33089760.

The previous prime is 82724419. The next prime is 82724459. The reversal of 82724420 is 2442728.

It can be written as a sum of positive squares in 2 ways, for example, as 17825284 + 64899136 = 4222^2 + 8056^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2068091 + ... + 2068130.

It is an arithmetic number, because the mean of its divisors is an integer number (14476777).

Almost surely, 2^82724420 is an apocalyptic number.

It is an amenable number.

82724420 is an abundant number, since it is smaller than the sum of its proper divisors (90996904).

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

82724420 is a wasteful number, since it uses less digits than its factorization.

82724420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4136230 (or 4136228 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 82724420 is about 9095.2965866980. The cubic root of 82724420 is about 435.7237609948.

The spelling of 82724420 in words is "eighty-two million, seven hundred twenty-four thousand, four hundred twenty".