25251642 has 48 divisors (see below), whose sum is σ = 60785280. Its totient is φ = 7766928.

The previous prime is 25251623. The next prime is 25251661. The reversal of 25251642 is 24615252.

It is an interprime number because it is at equal distance from previous prime (25251623) and next prime (25251661).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7743 + ... + 10509.

It is an arithmetic number, because the mean of its divisors is an integer number (1266360).

Almost surely, 2^25251642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25251642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30392640).

25251642 is an abundant number, since it is smaller than the sum of its proper divisors (35533638).

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

25251642 is a wasteful number, since it uses less digits than its factorization.

25251642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2804 (or 2785 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 25251642 is about 5025.1011930109. The cubic root of 25251642 is about 293.3795746086.

Adding to 25251642 its reverse (24615252), we get a palindrome (49866894).

The spelling of 25251642 in words is "twenty-five million, two hundred fifty-one thousand, six hundred forty-two".