721898622 has 32 divisors (see below), whose sum is σ = 1610215200. Its totient is φ = 239733504.

The previous prime is 721898599. The next prime is 721898629. The reversal of 721898622 is 226898127.

721898622 is a `hidden beast` number, since 7 + 2 + 18 + 9 + 8 + 622 = 666.

It is a super-2 number, since 2×721898622² = 1042275240890997768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721898629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10323 + ... + 39374.

It is an arithmetic number, because the mean of its divisors is an integer number (50319225).

Almost surely, 2^721898622 is an apocalyptic number.

721898622 is an abundant number, since it is smaller than the sum of its proper divisors (888316578).

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

721898622 is a wasteful number, since it uses less digits than its factorization.

721898622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49977 (or 49971 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 721898622 is about 26868.1711696200. The cubic root of 721898622 is about 897.0680813193.

The spelling of 721898622 in words is "seven hundred twenty-one million, eight hundred ninety-eight thousand, six hundred twenty-two".