25128902890 has 64 divisors (see below), whose sum is σ = 55691564544. Its totient is φ = 7949829888.

The previous prime is 25128902873. The next prime is 25128902891. The reversal of 25128902890 is 9820982152.

It is a self number, because there is not a number n which added to its sum of digits gives 25128902890.

It is not an unprimeable number, because it can be changed into a prime (25128902891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4180267 + ... + 4186273.

It is an arithmetic number, because the mean of its divisors is an integer number (870180696).

Almost surely, 2^25128902890 is an apocalyptic number.

25128902890 is an abundant number, since it is smaller than the sum of its proper divisors (30562661654).

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

25128902890 is a wasteful number, since it uses less digits than its factorization.

25128902890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10631.

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 25128902890 in words is "twenty-five billion, one hundred twenty-eight million, nine hundred two thousand, eight hundred ninety".