25234205436 has 72 divisors (see below), whose sum is σ = 71065822464. Its totient is φ = 7484027040.

The previous prime is 25234205401. The next prime is 25234205573. The reversal of 25234205436 is 63450243252.

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 25234205436.

It is a congruent number.

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, 659290 + ... + 696513.

It is an arithmetic number, because the mean of its divisors is an integer number (987025312).

Almost surely, 2^25234205436 is an apocalyptic number.

It is an amenable number.

25234205436 is an abundant number, since it is smaller than the sum of its proper divisors (45831617028).

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

25234205436 is a wasteful number, since it uses less digits than its factorization.

25234205436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355871 (or 1355866 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 25234205436 its reverse (63450243252), we get a palindrome (88684448688).

The spelling of 25234205436 in words is "twenty-five billion, two hundred thirty-four million, two hundred five thousand, four hundred thirty-six".