721628822 has 8 divisors (see below), whose sum is σ = 1082989656. Its totient is φ = 360632272.

The previous prime is 721628813. The next prime is 721628833. The reversal of 721628822 is 228826127.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×721628822² = 1041496313482215368, which contains 22 as substring.

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, 86063 + ... + 94074.

It is an arithmetic number, because the mean of its divisors is an integer number (135373707).

Almost surely, 2^721628822 is an apocalyptic number.

721628822 is a deficient number, since it is larger than the sum of its proper divisors (361360834).

721628822 is a wasteful number, since it uses less digits than its factorization.

721628822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182142.

The product of its digits is 43008, while the sum is 38.

The square root of 721628822 is about 26863.1498897653. The cubic root of 721628822 is about 896.9563116428.

The spelling of 721628822 in words is "seven hundred twenty-one million, six hundred twenty-eight thousand, eight hundred twenty-two".