746542721 has 4 divisors (see below), whose sum is σ = 750411012. Its totient is φ = 742674432.

The previous prime is 746542711. The next prime is 746542723. The reversal of 746542721 is 127245647.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127245647 = 1637 ⋅77731.

It can be written as a sum of positive squares in 2 ways, for example, as 133287025 + 613255696 = 11545^2 + 24764^2 .

It is a cyclic number.

It is not a de Polignac number, because 746542721 - 2¹⁴ = 746526337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (746542723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1933856 + ... + 1934241.

It is an arithmetic number, because the mean of its divisors is an integer number (187602753).

Almost surely, 2^746542721 is an apocalyptic number.

It is an amenable number.

746542721 is a deficient number, since it is larger than the sum of its proper divisors (3868291).

746542721 is a wasteful number, since it uses less digits than its factorization.

746542721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3868290.

The product of its digits is 94080, while the sum is 38.

The square root of 746542721 is about 27322.9339749596. The cubic root of 746542721 is about 907.1620806746.

The spelling of 746542721 in words is "seven hundred forty-six million, five hundred forty-two thousand, seven hundred twenty-one".