8720280 has 48 divisors (see below), whose sum is σ = 28342080. Its totient is φ = 2325312.

The previous prime is 8720233. The next prime is 8720281. The reversal of 8720280 is 820278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11752 + ... + 12471.

It is an arithmetic number, because the mean of its divisors is an integer number (590460).

Almost surely, 2^8720280 is an apocalyptic number.

It is an amenable number.

8720280 is an abundant number, since it is smaller than the sum of its proper divisors (19621800).

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

8720280 is a wasteful number, since it uses less digits than its factorization.

8720280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24240 (or 24233 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 8720280 is about 2953.0120216484. The cubic root of 8720280 is about 205.8306963480.

The spelling of 8720280 in words is "eight million, seven hundred twenty thousand, two hundred eighty".