25198998 has 64 divisors (see below), whose sum is σ = 59885568. Its totient is φ = 6981120.

The previous prime is 25198991. The next prime is 25199011. The reversal of 25198998 is 89989152.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 25198998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25198991) 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, 41211 + ... + 41817.

It is an arithmetic number, because the mean of its divisors is an integer number (935712).

Almost surely, 2^25198998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25198998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29942784).

25198998 is an abundant number, since it is smaller than the sum of its proper divisors (34686570).

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

25198998 is a wasteful number, since it uses less digits than its factorization.

25198998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677.

The product of its digits is 466560, while the sum is 51.

The square root of 25198998 is about 5019.8603566235. The cubic root of 25198998 is about 293.1755559331.

The spelling of 25198998 in words is "twenty-five million, one hundred ninety-eight thousand, nine hundred ninety-eight".