746728908721 has 4 divisors (see below), whose sum is σ = 747636235072. Its totient is φ = 745821582372.

The previous prime is 746728908713. The next prime is 746728908769. The reversal of 746728908721 is 127809827647.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 746728908721 - 2³ = 746728908713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 746728908721.

It is not an unprimeable number, because it can be changed into a prime (746728908701) 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, 453661941 + ... + 453663586.

It is an arithmetic number, because the mean of its divisors is an integer number (186909058768).

Almost surely, 2^746728908721 is an apocalyptic number.

It is an amenable number.

746728908721 is a deficient number, since it is larger than the sum of its proper divisors (907326351).

746728908721 is an equidigital number, since it uses as much as digits as its factorization.

746728908721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907326350.

The product of its (nonzero) digits is 18966528, while the sum is 61.

The spelling of 746728908721 in words is "seven hundred forty-six billion, seven hundred twenty-eight million, nine hundred eight thousand, seven hundred twenty-one".