820057286 has 4 divisors (see below), whose sum is σ = 1230085932. Its totient is φ = 410028642.

The previous prime is 820057283. The next prime is 820057289. The reversal of 820057286 is 682750028.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (820057283) and next prime (820057289).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820057283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205014320 + ... + 205014323.

It is an arithmetic number, because the mean of its divisors is an integer number (307521483).

Almost surely, 2^820057286 is an apocalyptic number.

820057286 is a deficient number, since it is larger than the sum of its proper divisors (410028646).

820057286 is a wasteful number, since it uses less digits than its factorization.

820057286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410028645.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 820057286 is about 28636.6423660317. The cubic root of 820057286 is about 936.0119582019.

The spelling of 820057286 in words is "eight hundred twenty million, fifty-seven thousand, two hundred eighty-six".