7278220 has 12 divisors (see below), whose sum is σ = 15284304. Its totient is φ = 2911280.

The previous prime is 7278209. The next prime is 7278239. The reversal of 7278220 is 228727.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181936 + ... + 181975.

It is an arithmetic number, because the mean of its divisors is an integer number (1273692).

Almost surely, 2^7278220 is an apocalyptic number.

It is an amenable number.

7278220 is an abundant number, since it is smaller than the sum of its proper divisors (8006084).

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

7278220 is a wasteful number, since it uses less digits than its factorization.

7278220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363920 (or 363918 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 7278220 is about 2697.8176365351. The cubic root of 7278220 is about 193.7946244768.

The spelling of 7278220 in words is "seven million, two hundred seventy-eight thousand, two hundred twenty".