25278966 has 80 divisors (see below), whose sum is σ = 61315056. Its totient is φ = 7755264.

The previous prime is 25278943. The next prime is 25278977. The reversal of 25278966 is 66987252.

It is a super-2 number, since 2×25278966² = 1278052244058312, 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 in 39 ways as a sum of consecutive naturals, for example, 184450 + ... + 184586.

Almost surely, 2^25278966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25278966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30657528).

25278966 is an abundant number, since it is smaller than the sum of its proper divisors (36036090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25278966 is a wasteful number, since it uses less digits than its factorization.

25278966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 226 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 25278966 is about 5027.8192091602. The cubic root of 25278966 is about 293.4853553712.

It can be divided in two parts, 25278 and 966, that added together give a square (26244 = 162²).

The spelling of 25278966 in words is "twenty-five million, two hundred seventy-eight thousand, nine hundred sixty-six".