7978220 has 24 divisors (see below), whose sum is σ = 17145744. Its totient is φ = 3116736.

The previous prime is 7978211. The next prime is 7978237. The reversal of 7978220 is 228797.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3779 + ... + 5498.

It is an arithmetic number, because the mean of its divisors is an integer number (714406).

Almost surely, 2^7978220 is an apocalyptic number.

It is an amenable number.

7978220 is an abundant number, since it is smaller than the sum of its proper divisors (9167524).

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

7978220 is a wasteful number, since it uses less digits than its factorization.

7978220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9329 (or 9327 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 7978220 is about 2824.5743042094. The cubic root of 7978220 is about 199.8183350392.

The spelling of 7978220 in words is "seven million, nine hundred seventy-eight thousand, two hundred twenty".