25553780 has 48 divisors (see below), whose sum is σ = 61622400. Its totient is φ = 8719488.

The previous prime is 25553753. The next prime is 25553821. The reversal of 25553780 is 8735552.

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 25553780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48599 + ... + 49121.

It is an arithmetic number, because the mean of its divisors is an integer number (1283800).

Almost surely, 2^25553780 is an apocalyptic number.

25553780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25553780 is an abundant number, since it is smaller than the sum of its proper divisors (36068620).

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

25553780 is a wasteful number, since it uses less digits than its factorization.

25553780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888 (or 886 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 25553780 is about 5055.0746779845. The cubic root of 25553780 is about 294.5450422717.

The spelling of 25553780 in words is "twenty-five million, five hundred fifty-three thousand, seven hundred eighty".