721241650 has 12 divisors (see below), whose sum is σ = 1341509562. Its totient is φ = 288496640.

The previous prime is 721241627. The next prime is 721241681. The reversal of 721241650 is 56142127.

It can be written as a sum of positive squares in 3 ways, for example, as 265461849 + 455779801 = 16293^2 + 21349^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7212367 + ... + 7212466.

Almost surely, 2^721241650 is an apocalyptic number.

721241650 is a deficient number, since it is larger than the sum of its proper divisors (620267912).

721241650 is a wasteful number, since it uses less digits than its factorization.

721241650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14424845 (or 14424840 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 721241650 is about 26855.9425453660. The cubic root of 721241650 is about 896.7958697441.

Adding to 721241650 its reverse (56142127), we get a palindrome (777383777).

The spelling of 721241650 in words is "seven hundred twenty-one million, two hundred forty-one thousand, six hundred fifty".