7997820 has 48 divisors (see below), whose sum is σ = 23714208. Its totient is φ = 2007040.

The previous prime is 7997789. The next prime is 7997831. The reversal of 7997820 is 287997.

7997820 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2901 + ... + 4940.

It is an arithmetic number, because the mean of its divisors is an integer number (494046).

Almost surely, 2^7997820 is an apocalyptic number.

It is an amenable number.

7997820 is an abundant number, since it is smaller than the sum of its proper divisors (15716388).

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

7997820 is a wasteful number, since it uses less digits than its factorization.

7997820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7870 (or 7868 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 7997820 is about 2828.0417252933. The cubic root of 7997820 is about 199.9818316829.

The spelling of 7997820 in words is "seven million, nine hundred ninety-seven thousand, eight hundred twenty".