742275721 has 8 divisors (see below), whose sum is σ = 817185600. Its totient is φ = 668604240.

The previous prime is 742275697. The next prime is 742275733. The reversal of 742275721 is 127572247.

742275721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 742275721 - 2¹¹ = 742273673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (742270721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 308341 + ... + 310738.

It is an arithmetic number, because the mean of its divisors is an integer number (102148200).

Almost surely, 2^742275721 is an apocalyptic number.

It is an amenable number.

742275721 is a deficient number, since it is larger than the sum of its proper divisors (74909879).

742275721 is a wasteful number, since it uses less digits than its factorization.

742275721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619199.

The product of its digits is 54880, while the sum is 37.

The square root of 742275721 is about 27244.7374918534. The cubic root of 742275721 is about 905.4304276092.

The spelling of 742275721 in words is "seven hundred forty-two million, two hundred seventy-five thousand, seven hundred twenty-one".