25400100 has 144 divisors (see below), whose sum is σ = 82494720. Its totient is φ = 5980800.

The previous prime is 25400083. The next prime is 25400147. The reversal of 25400100 is 100452.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141811 + ... + 141989.

It is an arithmetic number, because the mean of its divisors is an integer number (572880).

Almost surely, 2^25400100 is an apocalyptic number.

25400100 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 25400100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41247360).

25400100 is an abundant number, since it is smaller than the sum of its proper divisors (57094620).

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

25400100 is a wasteful number, since it uses less digits than its factorization.

25400100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 25400100 is about 5039.8511882793. The cubic root of 25400100 is about 293.9533916582.

Adding to 25400100 its reverse (100452), we get a palindrome (25500552).

The spelling of 25400100 in words is "twenty-five million, four hundred thousand, one hundred".