820076999 has 4 divisors (see below), whose sum is σ = 937230864. Its totient is φ = 702923136.

The previous prime is 820076911. The next prime is 820077001. The reversal of 820076999 is 999670028.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820076999 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 (820076099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58576922 + ... + 58576935.

It is an arithmetic number, because the mean of its divisors is an integer number (234307716).

Almost surely, 2^820076999 is an apocalyptic number.

820076999 is a deficient number, since it is larger than the sum of its proper divisors (117153865).

820076999 is a wasteful number, since it uses less digits than its factorization.

820076999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117153864.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 820076999 is about 28636.9865558512. The cubic root of 820076999 is about 936.0194582697.

The spelling of 820076999 in words is "eight hundred twenty million, seventy-six thousand, nine hundred ninety-nine".