25999816 has 8 divisors (see below), whose sum is σ = 48749670. Its totient is φ = 12999904.

The previous prime is 25999807. The next prime is 25999829. The reversal of 25999816 is 61899952.

It can be written as a sum of positive squares in only one way, i.e., 22562500 + 3437316 = 4750^2 + 1854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 25999816.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1624981 + ... + 1624996.

Almost surely, 2^25999816 is an apocalyptic number.

It is an amenable number.

25999816 is a deficient number, since it is larger than the sum of its proper divisors (22749854).

25999816 is a wasteful number, since it uses less digits than its factorization.

25999816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249983 (or 3249979 counting only the distinct ones).

The product of its digits is 349920, while the sum is 49.

The square root of 25999816 is about 5099.0014708764. The cubic root of 25999816 is about 296.2489079939.

The spelling of 25999816 in words is "twenty-five million, nine hundred ninety-nine thousand, eight hundred sixteen".