25749780 has 96 divisors (see below), whose sum is σ = 84677376. Its totient is φ = 5723136.

The previous prime is 25749761. The next prime is 25749791. The reversal of 25749780 is 8794752.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14712 + ... + 16368.

It is an arithmetic number, because the mean of its divisors is an integer number (882056).

Almost surely, 2^25749780 is an apocalyptic number.

25749780 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 25749780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42338688).

25749780 is an abundant number, since it is smaller than the sum of its proper divisors (58927596).

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

25749780 is a wasteful number, since it uses less digits than its factorization.

25749780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713 (or 1711 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 25749780 is about 5074.4241052557. The cubic root of 25749780 is about 295.2961882035.

The spelling of 25749780 in words is "twenty-five million, seven hundred forty-nine thousand, seven hundred eighty".