721949274 has 80 divisors (see below), whose sum is σ = 1683448800. Its totient is φ = 231063840.

The previous prime is 721949269. The next prime is 721949299. The reversal of 721949274 is 472949127.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 424077 + ... + 425775.

It is an arithmetic number, because the mean of its divisors is an integer number (21043110).

Almost surely, 2^721949274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721949274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841724400).

721949274 is an abundant number, since it is smaller than the sum of its proper divisors (961499526).

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

721949274 is a wasteful number, since it uses less digits than its factorization.

721949274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817 (or 1808 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 721949274 is about 26869.1137553884. The cubic root of 721949274 is about 897.0890617490.

The spelling of 721949274 in words is "seven hundred twenty-one million, nine hundred forty-nine thousand, two hundred seventy-four".