25720615 has 8 divisors (see below), whose sum is σ = 30895200. Its totient is φ = 20556192.

The previous prime is 25720613. The next prime is 25720619. The reversal of 25720615 is 51602752.

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

It is a cyclic number.

It is not a de Polignac number, because 25720615 - 2¹ = 25720613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25720613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5157 + ... + 8833.

It is an arithmetic number, because the mean of its divisors is an integer number (3861900).

Almost surely, 2^25720615 is an apocalyptic number.

25720615 is a deficient number, since it is larger than the sum of its proper divisors (5174585).

25720615 is a wasteful number, since it uses less digits than its factorization.

25720615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5081.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 25720615 is about 5071.5495659611. The cubic root of 25720615 is about 295.1846588765.

It can be divided in two parts, 25720 and 615, that added together give a triangular number (26335 = T₂₂₉).

The spelling of 25720615 in words is "twenty-five million, seven hundred twenty thousand, six hundred fifteen".