25684428 has 162 divisors, whose sum is σ = 80874108. Its totient is φ = 6320160.

The previous prime is 25684427. The next prime is 25684429. The reversal of 25684428 is 82448652.

It is an interprime number because it is at equal distance from previous prime (25684427) and next prime (25684429).

It is not an unprimeable number, because it can be changed into a prime (25684423) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1351803 + ... + 1351821.

Almost surely, 2^25684428 is an apocalyptic number.

25684428 is a gapful number since it is divisible by the number (28) 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 25684428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40437054).

25684428 is an abundant number, since it is smaller than the sum of its proper divisors (55189680).

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

25684428 is a wasteful number, since it uses less digits than its factorization.

25684428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 42 counting only the distinct ones).

The product of its digits is 122880, while the sum is 39.

The square root of 25684428 is about 5067.9806629465. The cubic root of 25684428 is about 295.0461595872.

It can be divided in two parts, 2568 and 4428, that added together give a palindrome (6996).

The spelling of 25684428 in words is "twenty-five million, six hundred eighty-four thousand, four hundred twenty-eight".