820499975 has 24 divisors (see below), whose sum is σ = 1047336240. Its totient is φ = 637182720.

The previous prime is 820499963. The next prime is 820499983. The reversal of 820499975 is 579994028.

It is a de Polignac number, because none of the positive numbers 2^k-820499975 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 571859 + ... + 573291.

It is an arithmetic number, because the mean of its divisors is an integer number (43639010).

Almost surely, 2^820499975 is an apocalyptic number.

820499975 is a deficient number, since it is larger than the sum of its proper divisors (226836265).

820499975 is a wasteful number, since it uses less digits than its factorization.

820499975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099 (or 2094 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 820499975 is about 28644.3707384191. The cubic root of 820499975 is about 936.1803560548.

The spelling of 820499975 in words is "eight hundred twenty million, four hundred ninety-nine thousand, nine hundred seventy-five".