7221657880 has 32 divisors (see below), whose sum is σ = 16254905040. Its totient is φ = 2887565440.

The previous prime is 7221657869. The next prime is 7221657887. The reversal of 7221657880 is 887561227.

It is a self number, because there is not a number n which added to its sum of digits gives 7221657880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221657887) 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, 76707 + ... + 142573.

Almost surely, 2^7221657880 is an apocalyptic number.

It is an amenable number.

7221657880 is an abundant number, since it is smaller than the sum of its proper divisors (9033247160).

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

7221657880 is a wasteful number, since it uses less digits than its factorization.

7221657880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68619 (or 68615 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 7221657880 is about 84980.3381965499. The cubic root of 7221657880 is about 1932.9129841849.

The spelling of 7221657880 in words is "seven billion, two hundred twenty-one million, six hundred fifty-seven thousand, eight hundred eighty".