25198740 has 108 divisors (see below), whose sum is σ = 88946676. Its totient is φ = 5757696.

The previous prime is 25198727. The next prime is 25198751. The reversal of 25198740 is 4789152.

It can be written as a sum of positive squares in 2 ways, for example, as 13046544 + 12152196 = 3612^2 + 3486^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25198695 and 25198704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7392 + ... + 10248.

It is a vampire number, since it can be written as 2940 ⋅ 8571 (with its own digits).

Almost surely, 2^25198740 is an apocalyptic number.

25198740 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 25198740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44473338).

25198740 is an abundant number, since it is smaller than the sum of its proper divisors (63747936).

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

25198740 is a wasteful number, since it uses less digits than its factorization.

25198740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2886 (or 2874 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 25198740 is about 5019.8346586317. The cubic root of 25198740 is about 293.1745553702.

It can be divided in two parts, 25 and 198740, that added together give a triangular number (198765 = T₆₃₀).

The spelling of 25198740 in words is "twenty-five million, one hundred ninety-eight thousand, seven hundred forty".