723695721 has 8 divisors (see below), whose sum is σ = 1102774464. Its totient is φ = 413540400.

The previous prime is 723695699. The next prime is 723695771. The reversal of 723695721 is 127596327.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 723695721 - 2²² = 719501417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (723695771) 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, 17230830 + ... + 17230871.

It is an arithmetic number, because the mean of its divisors is an integer number (137846808).

Almost surely, 2^723695721 is an apocalyptic number.

It is an amenable number.

723695721 is a deficient number, since it is larger than the sum of its proper divisors (379078743).

723695721 is a wasteful number, since it uses less digits than its factorization.

723695721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34461711.

The product of its digits is 158760, while the sum is 42.

The square root of 723695721 is about 26901.5932799528. The cubic root of 723695721 is about 897.8118534636.

The spelling of 723695721 in words is "seven hundred twenty-three million, six hundred ninety-five thousand, seven hundred twenty-one".