25724878 has 4 divisors (see below), whose sum is σ = 38587320. Its totient is φ = 12862438.

The previous prime is 25724861. The next prime is 25724887. The reversal of 25724878 is 87842752.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×25724878² = 1323538696229768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6431218 + ... + 6431221.

It is an arithmetic number, because the mean of its divisors is an integer number (9646830).

Almost surely, 2^25724878 is an apocalyptic number.

25724878 is a deficient number, since it is larger than the sum of its proper divisors (12862442).

25724878 is a wasteful number, since it uses less digits than its factorization.

25724878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12862441.

The product of its digits is 250880, while the sum is 43.

The square root of 25724878 is about 5071.9698342952. The cubic root of 25724878 is about 295.2009661937.

The spelling of 25724878 in words is "twenty-five million, seven hundred twenty-four thousand, eight hundred seventy-eight".