721626849 has 12 divisors (see below), whose sum is σ = 1043770000. Its totient is φ = 480429144.

The previous prime is 721626847. The next prime is 721626869. The reversal of 721626849 is 948626127.

It is a happy number.

It is not a de Polignac number, because 721626849 - 2¹ = 721626847 is a prime.

It is a super-3 number, since 3×721626849³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721626847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47599 + ... + 60900.

Almost surely, 2^721626849 is an apocalyptic number.

It is an amenable number.

721626849 is a deficient number, since it is larger than the sum of its proper divisors (322143151).

721626849 is a wasteful number, since it uses less digits than its factorization.

721626849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109244 (or 109241 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 721626849 is about 26863.1131665710. The cubic root of 721626849 is about 896.9554941882.

The spelling of 721626849 in words is "seven hundred twenty-one million, six hundred twenty-six thousand, eight hundred forty-nine".