25221672 has 96 divisors (see below), whose sum is σ = 81532800. Its totient is φ = 7203168.

The previous prime is 25221671. The next prime is 25221673. The reversal of 25221672 is 27612252.

It is an interprime number because it is at equal distance from previous prime (25221671) and next prime (25221673).

It is a super-2 number, since 2×25221672² = 1272265476951168, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (25221671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9393 + ... + 11775.

It is an arithmetic number, because the mean of its divisors is an integer number (849300).

Almost surely, 2^25221672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25221672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40766400).

25221672 is an abundant number, since it is smaller than the sum of its proper divisors (56311128).

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

25221672 is a wasteful number, since it uses less digits than its factorization.

25221672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412 (or 2395 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 25221672 is about 5022.1182781770. The cubic root of 25221672 is about 293.2634624676.

The spelling of 25221672 in words is "twenty-five million, two hundred twenty-one thousand, six hundred seventy-two".