25528782636 has 180 divisors, whose sum is σ = 79287249888. Its totient is φ = 7138539072.

The previous prime is 25528782599. The next prime is 25528782647. The reversal of 25528782636 is 63628782552.

It is a happy number.

25528782636 is a `hidden beast` number, since 2 + 5 + 528 + 7 + 82 + 6 + 36 = 666.

It is a super-2 number, since 2×25528782636² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) 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 (54).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 729066 + ... + 763278.

Almost surely, 2^25528782636 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 25528782636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39643624944).

25528782636 is an abundant number, since it is smaller than the sum of its proper divisors (53758467252).

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

25528782636 is a wasteful number, since it uses less digits than its factorization.

25528782636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34290 (or 34272 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 54.

The spelling of 25528782636 in words is "twenty-five billion, five hundred twenty-eight million, seven hundred eighty-two thousand, six hundred thirty-six".