25278869 has 16 divisors (see below), whose sum is σ = 31674240. Its totient is φ = 19599360.

The previous prime is 25278839. The next prime is 25278871. The reversal of 25278869 is 96887252.

It is not a de Polignac number, because 25278869 - 2¹² = 25274773 is a prime.

It is a super-2 number, since 2×25278869² = 1278042435838322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25278839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17237 + ... + 18645.

It is an arithmetic number, because the mean of its divisors is an integer number (1979640).

Almost surely, 2^25278869 is an apocalyptic number.

It is an amenable number.

25278869 is a deficient number, since it is larger than the sum of its proper divisors (6395371).

25278869 is a wasteful number, since it uses less digits than its factorization.

25278869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660.

The product of its digits is 483840, while the sum is 47.

The square root of 25278869 is about 5027.8095628216. The cubic root of 25278869 is about 293.4849799851.

The spelling of 25278869 in words is "twenty-five million, two hundred seventy-eight thousand, eight hundred sixty-nine".