25478784 has 96 divisors (see below), whose sum is σ = 77690340. Its totient is φ = 7987200.

The previous prime is 25478777. The next prime is 25478797. The reversal of 25478784 is 48787452.

It can be written as a sum of positive squares in 2 ways, for example, as 24206400 + 1272384 = 4920^2 + 1128^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18934 + ... + 20234.

Almost surely, 2^25478784 is an apocalyptic number.

25478784 is a gapful number since it is divisible by the number (24) 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 25478784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38845170).

25478784 is an abundant number, since it is smaller than the sum of its proper divisors (52211556).

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

25478784 is a wasteful number, since it uses less digits than its factorization.

25478784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1323 counting only the distinct ones).

The product of its digits is 501760, while the sum is 45.

The square root of 25478784 is about 5047.6513350270. The cubic root of 25478784 is about 294.2566133826.

It can be divided in two parts, 25478 and 784, that added together give a palindrome (26262).

The spelling of 25478784 in words is "twenty-five million, four hundred seventy-eight thousand, seven hundred eighty-four".