23578721 has 2 divisors, whose sum is σ = 23578722. Its totient is φ = 23578720.

The previous prime is 23578699. The next prime is 23578729. The reversal of 23578721 is 12787532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 3900625 = 4436^2 + 1975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23578721 is a prime.

It is not a weakly prime, because it can be changed into another prime (23578729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11789360 + 11789361.

It is an arithmetic number, because the mean of its divisors is an integer number (11789361).

Almost surely, 2^23578721 is an apocalyptic number.

It is an amenable number.

23578721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23578721 is an equidigital number, since it uses as much as digits as its factorization.

23578721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 35.

The square root of 23578721 is about 4855.7925202793. The cubic root of 23578721 is about 286.7521929473.

The spelling of 23578721 in words is "twenty-three million, five hundred seventy-eight thousand, seven hundred twenty-one".