25277685420 has 96 divisors (see below), whose sum is σ = 76435107840. Its totient is φ = 6204798720.

The previous prime is 25277685347. The next prime is 25277685449. The reversal of 25277685420 is 2458677252.

It is a super-2 number, since 2×25277685420² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25277685420.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234885 + ... + 325155.

It is an arithmetic number, because the mean of its divisors is an integer number (796199040).

Almost surely, 2^25277685420 is an apocalyptic number.

25277685420 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 25277685420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38217553920).

25277685420 is an abundant number, since it is smaller than the sum of its proper divisors (51157422420).

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

25277685420 is a wasteful number, since it uses less digits than its factorization.

25277685420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90655 (or 90653 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 48.

The spelling of 25277685420 in words is "twenty-five billion, two hundred seventy-seven million, six hundred eighty-five thousand, four hundred twenty".