23077721 has 4 divisors (see below), whose sum is σ = 24435252. Its totient is φ = 21720192.

The previous prime is 23077697. The next prime is 23077727. The reversal of 23077721 is 12777032.

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 14440000 + 8637721 = 3800^2 + 2939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23077721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23077727) 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, 678740 + ... + 678773.

It is an arithmetic number, because the mean of its divisors is an integer number (6108813).

Almost surely, 2^23077721 is an apocalyptic number.

It is an amenable number.

23077721 is a deficient number, since it is larger than the sum of its proper divisors (1357531).

23077721 is a wasteful number, since it uses less digits than its factorization.

23077721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357530.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 23077721 is about 4803.9276639017. The cubic root of 23077721 is about 284.7066685470.

The spelling of 23077721 in words is "twenty-three million, seventy-seven thousand, seven hundred twenty-one".