25278886776 has 128 divisors (see below), whose sum is σ = 74364998400. Its totient is φ = 7059655680.

The previous prime is 25278886771. The next prime is 25278886781. The reversal of 25278886776 is 67768887252.

It is an interprime number because it is at equal distance from previous prime (25278886771) and next prime (25278886781).

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25278886771) 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, 2256100 + ... + 2267276.

It is an arithmetic number, because the mean of its divisors is an integer number (580976550).

Almost surely, 2^25278886776 is an apocalyptic number.

25278886776 is a gapful number since it is divisible by the number (26) 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 25278886776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37182499200).

25278886776 is an abundant number, since it is smaller than the sum of its proper divisors (49086111624).

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

25278886776 is a wasteful number, since it uses less digits than its factorization.

25278886776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11869 (or 11865 counting only the distinct ones).

The product of its digits is 126443520, while the sum is 66.

The spelling of 25278886776 in words is "twenty-five billion, two hundred seventy-eight million, eight hundred eighty-six thousand, seven hundred seventy-six".