721123880 has 16 divisors (see below), whose sum is σ = 1622528820. Its totient is φ = 288449536.

The previous prime is 721123877. The next prime is 721123913. The reversal of 721123880 is 88321127.

It can be written as a sum of positive squares in 2 ways, for example, as 681105604 + 40018276 = 26098^2 + 6326^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9014009 + ... + 9014088.

Almost surely, 2^721123880 is an apocalyptic number.

It is an amenable number.

721123880 is an abundant number, since it is smaller than the sum of its proper divisors (901404940).

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

721123880 is a wasteful number, since it uses less digits than its factorization.

721123880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18028108 (or 18028104 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 721123880 is about 26853.7498312619. The cubic root of 721123880 is about 896.7470551299.

The spelling of 721123880 in words is "seven hundred twenty-one million, one hundred twenty-three thousand, eight hundred eighty".