25501572 has 72 divisors (see below), whose sum is σ = 70848960. Its totient is φ = 7698240.

The previous prime is 25501571. The next prime is 25501573. The reversal of 25501572 is 27510552.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25501571) and next prime (25501573).

It is not an unprimeable number, because it can be changed into a prime (25501571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14922 + ... + 16542.

Almost surely, 2^25501572 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 25501572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35424480).

25501572 is an abundant number, since it is smaller than the sum of its proper divisors (45347388).

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

25501572 is a wasteful number, since it uses less digits than its factorization.

25501572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1668 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 25501572 is about 5049.9081179760. The cubic root of 25501572 is about 294.3443140827.

The spelling of 25501572 in words is "twenty-five million, five hundred one thousand, five hundred seventy-two".