746817721 has 8 divisors (see below), whose sum is σ = 804932744. Its totient is φ = 688798080.

The previous prime is 746817703. The next prime is 746817737. The reversal of 746817721 is 127718647.

It can be written as a sum of positive squares in 4 ways, for example, as 13220496 + 733597225 = 3636^2 + 27085^2 .

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 746817721 - 2¹⁷ = 746686649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (746812721) 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 7 ways as a sum of consecutive naturals, for example, 7140 + ... + 39301.

It is an arithmetic number, because the mean of its divisors is an integer number (100616593).

Almost surely, 2^746817721 is an apocalyptic number.

It is an amenable number.

746817721 is a deficient number, since it is larger than the sum of its proper divisors (58115023).

746817721 is a wasteful number, since it uses less digits than its factorization.

746817721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47691.

The product of its digits is 131712, while the sum is 43.

The square root of 746817721 is about 27327.9659140595. The cubic root of 746817721 is about 907.2734558353.

The spelling of 746817721 in words is "seven hundred forty-six million, eight hundred seventeen thousand, seven hundred twenty-one".