7978280 has 16 divisors (see below), whose sum is σ = 17951220. Its totient is φ = 3191296.

The previous prime is 7978279. The next prime is 7978301. The reversal of 7978280 is 828797.

It can be written as a sum of positive squares in 2 ways, for example, as 7496644 + 481636 = 2738^2 + 694^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99689 + ... + 99768.

Almost surely, 2^7978280 is an apocalyptic number.

It is an amenable number.

7978280 is an abundant number, since it is smaller than the sum of its proper divisors (9972940).

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

7978280 is a wasteful number, since it uses less digits than its factorization.

7978280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199468 (or 199464 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 7978280 is about 2824.5849252589. The cubic root of 7978280 is about 199.8188359475.

The spelling of 7978280 in words is "seven million, nine hundred seventy-eight thousand, two hundred eighty".