25161420 has 48 divisors (see below), whose sum is σ = 70989408. Its totient is φ = 6658560.

The previous prime is 25161401. The next prime is 25161439. The reversal of 25161420 is 2416152.

It is an interprime number because it is at equal distance from previous prime (25161401) and next prime (25161439).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6690 + ... + 9750.

It is an arithmetic number, because the mean of its divisors is an integer number (1478946).

Almost surely, 2^25161420 is an apocalyptic number.

25161420 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 25161420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35494704).

25161420 is an abundant number, since it is smaller than the sum of its proper divisors (45827988).

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

25161420 is a wasteful number, since it uses less digits than its factorization.

25161420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210 (or 3208 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 25161420 is about 5016.1160273662. The cubic root of 25161420 is about 293.0297507716.

Adding to 25161420 its reverse (2416152), we get a palindrome (27577572).

The spelling of 25161420 in words is "twenty-five million, one hundred sixty-one thousand, four hundred twenty".