746688221 has 4 divisors (see below), whose sum is σ = 760776732. Its totient is φ = 732599712.

The previous prime is 746688193. The next prime is 746688281. The reversal of 746688221 is 122886647.

746688221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 615585721 + 131102500 = 24811^2 + 11450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-746688221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (746688281) 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, 7044176 + ... + 7044281.

It is an arithmetic number, because the mean of its divisors is an integer number (190194183).

Almost surely, 2^746688221 is an apocalyptic number.

It is an amenable number.

746688221 is a deficient number, since it is larger than the sum of its proper divisors (14088511).

746688221 is a wasteful number, since it uses less digits than its factorization.

746688221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14088510.

The product of its digits is 258048, while the sum is 44.

The square root of 746688221 is about 27325.5964436277. The cubic root of 746688221 is about 907.2210116663.

The spelling of 746688221 in words is "seven hundred forty-six million, six hundred eighty-eight thousand, two hundred twenty-one".