25720823 has 2 divisors, whose sum is σ = 25720824. Its totient is φ = 25720822.

The previous prime is 25720801. The next prime is 25720841. The reversal of 25720823 is 32802752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25720823 - 2⁶ = 25720759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25720853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12860411 + 12860412.

It is an arithmetic number, because the mean of its divisors is an integer number (12860412).

Almost surely, 2^25720823 is an apocalyptic number.

25720823 is a deficient number, since it is larger than the sum of its proper divisors (1).

25720823 is an equidigital number, since it uses as much as digits as its factorization.

25720823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 25720823 is about 5071.5700724726. The cubic root of 25720823 is about 295.1854545838.

The spelling of 25720823 in words is "twenty-five million, seven hundred twenty thousand, eight hundred twenty-three".