8721980 has 24 divisors (see below), whose sum is σ = 18461520. Its totient is φ = 3461120.

The previous prime is 8721941. The next prime is 8721989. The reversal of 8721980 is 891278.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 8721980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 956 + ... + 4284.

It is an arithmetic number, because the mean of its divisors is an integer number (769230).

Almost surely, 2^8721980 is an apocalyptic number.

It is an amenable number.

8721980 is an abundant number, since it is smaller than the sum of its proper divisors (9739540).

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

8721980 is a wasteful number, since it uses less digits than its factorization.

8721980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3469 (or 3467 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 8721980 is about 2953.2998493211. The cubic root of 8721980 is about 205.8440708974.

The spelling of 8721980 in words is "eight million, seven hundred twenty-one thousand, nine hundred eighty".