7997800 has 24 divisors (see below), whose sum is σ = 18595350. Its totient is φ = 3199040.

The previous prime is 7997789. The next prime is 7997831. The reversal of 7997800 is 87997.

It can be written as a sum of positive squares in 3 ways, for example, as 4485924 + 3511876 = 2118^2 + 1874^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19795 + ... + 20194.

Almost surely, 2^7997800 is an apocalyptic number.

It is an amenable number.

7997800 is an abundant number, since it is smaller than the sum of its proper divisors (10597550).

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

7997800 is a wasteful number, since it uses less digits than its factorization.

7997800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40005 (or 39996 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 7997800 is about 2828.0381892754. The cubic root of 7997800 is about 199.9816649859.

It can be divided in two parts, 79 and 97800, that added together give a palindrome (97879).

The spelling of 7997800 in words is "seven million, nine hundred ninety-seven thousand, eight hundred".