721240741 has 16 divisors (see below), whose sum is σ = 839708800. Its totient is φ = 613666368.

The previous prime is 721240673. The next prime is 721240783. The reversal of 721240741 is 147042127.

It is a cyclic number.

It is not a de Polignac number, because 721240741 - 2⁹ = 721240229 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721240841) 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, 30321 + ... + 48598.

It is an arithmetic number, because the mean of its divisors is an integer number (52481800).

Almost surely, 2^721240741 is an apocalyptic number.

It is an amenable number.

721240741 is a deficient number, since it is larger than the sum of its proper divisors (118468059).

721240741 is a wasteful number, since it uses less digits than its factorization.

721240741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78988.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 721240741 is about 26855.9256217320. The cubic root of 721240741 is about 896.7954929921.

Adding to 721240741 its reverse (147042127), we get a palindrome (868282868).

The spelling of 721240741 in words is "seven hundred twenty-one million, two hundred forty thousand, seven hundred forty-one".