721878748 has 12 divisors (see below), whose sum is σ = 1264123672. Its totient is φ = 360700560.

The previous prime is 721878737. The next prime is 721878763. The reversal of 721878748 is 847878127.

It is a super-2 number, since 2×721878748² = 1042217853628095008, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721878695 and 721878704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52815 + ... + 65062.

Almost surely, 2^721878748 is an apocalyptic number.

It is an amenable number.

721878748 is a deficient number, since it is larger than the sum of its proper divisors (542244924).

721878748 is a wasteful number, since it uses less digits than its factorization.

721878748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119412 (or 119410 counting only the distinct ones).

The product of its digits is 1404928, while the sum is 52.

The square root of 721878748 is about 26867.8013242617. The cubic root of 721878748 is about 897.0598490948.

The spelling of 721878748 in words is "seven hundred twenty-one million, eight hundred seventy-eight thousand, seven hundred forty-eight".