25869780 has 72 divisors (see below), whose sum is σ = 81393312. Its totient is φ = 6897312.

The previous prime is 25869743. The next prime is 25869791. The reversal of 25869780 is 8796852.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2199 + ... + 7521.

Almost surely, 2^25869780 is an apocalyptic number.

25869780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25869780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40696656).

25869780 is an abundant number, since it is smaller than the sum of its proper divisors (55523532).

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

25869780 is a wasteful number, since it uses less digits than its factorization.

25869780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5347 (or 5333 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 25869780 is about 5086.2343634559. The cubic root of 25869780 is about 295.7541939118.

The spelling of 25869780 in words is "twenty-five million, eight hundred sixty-nine thousand, seven hundred eighty".