23391320728 has 32 divisors (see below), whose sum is σ = 44187796800. Its totient is φ = 11608077312.

The previous prime is 23391320699. The next prime is 23391320741. The reversal of 23391320728 is 82702319332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1156801 + ... + 1176847.

It is an arithmetic number, because the mean of its divisors is an integer number (1380868650).

Almost surely, 2^23391320728 is an apocalyptic number.

It is an amenable number.

23391320728 is a deficient number, since it is larger than the sum of its proper divisors (20796476072).

23391320728 is a wasteful number, since it uses less digits than its factorization.

23391320728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21139 (or 21135 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 23391320728 in words is "twenty-three billion, three hundred ninety-one million, three hundred twenty thousand, seven hundred twenty-eight".