25538816 has 18 divisors (see below), whose sum is σ = 50978382. Its totient is φ = 12769280.

The previous prime is 25538803. The next prime is 25538827. The reversal of 25538816 is 61883552.

It can be written as a sum of positive squares in only one way, i.e., 16777216 + 8761600 = 4096^2 + 2960^2 .

It is a super-2 number, since 2×25538816² = 1304462245363712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25538816.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49625 + ... + 50136.

Almost surely, 2^25538816 is an apocalyptic number.

It is an amenable number.

25538816 is a deficient number, since it is larger than the sum of its proper divisors (25439566).

25538816 is an frugal number, since it uses more digits than its factorization.

25538816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99777 (or 99763 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 25538816 is about 5053.5943644103. The cubic root of 25538816 is about 294.4875369811.

The spelling of 25538816 in words is "twenty-five million, five hundred thirty-eight thousand, eight hundred sixteen".