25128005004 has 72 divisors (see below), whose sum is σ = 66475128720. Its totient is φ = 8299122624.

The previous prime is 25128005003. The next prime is 25128005033. The reversal of 25128005004 is 40050082152.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (25128005003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12639 + ... + 224534.

Almost surely, 2^25128005004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25128005004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33237564360).

25128005004 is an abundant number, since it is smaller than the sum of its proper divisors (41347123716).

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

25128005004 is a wasteful number, since it uses less digits than its factorization.

25128005004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237301 (or 237287 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 25128005004 its reverse (40050082152), we get a palindrome (65178087156).

The spelling of 25128005004 in words is "twenty-five billion, one hundred twenty-eight million, five thousand, four".