748636721 has 8 divisors (see below), whose sum is σ = 856095744. Its totient is φ = 641305440.

The previous prime is 748636717. The next prime is 748636723. The reversal of 748636721 is 127636847.

748636721 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 748636721 - 2² = 748636717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (748636723) 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, 19025 + ... + 43118.

It is an arithmetic number, because the mean of its divisors is an integer number (107011968).

Almost surely, 2^748636721 is an apocalyptic number.

It is an amenable number.

748636721 is a deficient number, since it is larger than the sum of its proper divisors (107459023).

748636721 is a wasteful number, since it uses less digits than its factorization.

748636721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63871.

The product of its digits is 338688, while the sum is 44.

The square root of 748636721 is about 27361.2265989666. The cubic root of 748636721 is about 908.0094642321.

The spelling of 748636721 in words is "seven hundred forty-eight million, six hundred thirty-six thousand, seven hundred twenty-one".