25438536 has 80 divisors (see below), whose sum is σ = 73246140. Its totient is φ = 8242560.

The previous prime is 25438531. The next prime is 25438537. The reversal of 25438536 is 63583452.

It is a happy number.

25438536 is a `hidden beast` number, since 2 + 543 + 85 + 36 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23097636 + 2340900 = 4806^2 + 1530^2 .

It is a super-2 number, since 2×25438536² = 1294238227646592, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 25438536.

It is not an unprimeable number, because it can be changed into a prime (25438531) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23446 + ... + 24506.

Almost surely, 2^25438536 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 25438536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36623070).

25438536 is an abundant number, since it is smaller than the sum of its proper divisors (47807604).

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

25438536 is a wasteful number, since it uses less digits than its factorization.

25438536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1103 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 25438536 is about 5043.6629546392. The cubic root of 25438536 is about 294.1015892159.

The spelling of 25438536 in words is "twenty-five million, four hundred thirty-eight thousand, five hundred thirty-six".