746733721 has 4 divisors (see below), whose sum is σ = 790659252. Its totient is φ = 702808192.

The previous prime is 746733671. The next prime is 746733727. The reversal of 746733721 is 127337647.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 478953225 + 267780496 = 21885^2 + 16364^2 .

It is a cyclic number.

It is not a de Polignac number, because 746733721 - 2¹⁵ = 746700953 is a prime.

It is a super-2 number, since 2×746733721² = 1115222500157011682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (746733727) 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, 21962740 + ... + 21962773.

It is an arithmetic number, because the mean of its divisors is an integer number (197664813).

Almost surely, 2^746733721 is an apocalyptic number.

It is an amenable number.

746733721 is a deficient number, since it is larger than the sum of its proper divisors (43925531).

746733721 is a wasteful number, since it uses less digits than its factorization.

746733721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43925530.

The product of its digits is 148176, while the sum is 40.

The square root of 746733721 is about 27326.4289836781. The cubic root of 746733721 is about 907.2394386869.

The spelling of 746733721 in words is "seven hundred forty-six million, seven hundred thirty-three thousand, seven hundred twenty-one".