25685867780 has 96 divisors (see below), whose sum is σ = 59519674368. Its totient is φ = 9278438400.

The previous prime is 25685867777. The next prime is 25685867789. The reversal of 25685867780 is 8776858652.

It is a super-2 number, since 2×25685867780² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is not an unprimeable number, because it can be changed into a prime (25685867789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 562694 + ... + 606626.

It is an arithmetic number, because the mean of its divisors is an integer number (619996608).

Almost surely, 2^25685867780 is an apocalyptic number.

25685867780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25685867780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29759837184).

25685867780 is an abundant number, since it is smaller than the sum of its proper divisors (33833806588).

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

25685867780 is a wasteful number, since it uses less digits than its factorization.

25685867780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44037 (or 44035 counting only the distinct ones).

The product of its (nonzero) digits is 45158400, while the sum is 62.

The spelling of 25685867780 in words is "twenty-five billion, six hundred eighty-five million, eight hundred sixty-seven thousand, seven hundred eighty".