25990004736 has 308 divisors, whose sum is σ = 82518717222. Its totient is φ = 8153726976.

The previous prime is 25990004723. The next prime is 25990004737. The reversal of 25990004736 is 63740009952.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19110297600 + 6879707136 = 138240^2 + 82944^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25990004691 and 25990004700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25990004737) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1528823800 + ... + 1528823816.

Almost surely, 2^25990004736 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 25990004736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41259358611).

25990004736 is an abundant number, since it is smaller than the sum of its proper divisors (56528712486).

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

25990004736 is an frugal number, since it uses more digits than its factorization.

25990004736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 22 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 25990004736 in words is "twenty-five billion, nine hundred ninety million, four thousand, seven hundred thirty-six".