25616780 has 48 divisors (see below), whose sum is σ = 62420736. Its totient is φ = 8648640.

The previous prime is 25616771. The next prime is 25616813. The reversal of 25616780 is 8761652.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 25616780.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8015 + ... + 10745.

It is an arithmetic number, because the mean of its divisors is an integer number (1300432).

Almost surely, 2^25616780 is an apocalyptic number.

25616780 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 25616780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31210368).

25616780 is an abundant number, since it is smaller than the sum of its proper divisors (36803956).

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

25616780 is a wasteful number, since it uses less digits than its factorization.

25616780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2814 (or 2812 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 25616780 is about 5061.3022039787. The cubic root of 25616780 is about 294.7868996275.

The spelling of 25616780 in words is "twenty-five million, six hundred sixteen thousand, seven hundred eighty".