25127997720 has 768 divisors, whose sum is σ = 97511040000. Its totient is φ = 5146251264.

The previous prime is 25127997709. The next prime is 25127997733. The reversal of 25127997720 is 2779972152.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 168644206 + ... + 168644354.

It is an arithmetic number, because the mean of its divisors is an integer number (126967500).

Almost surely, 2^25127997720 is an apocalyptic number.

25127997720 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 25127997720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48755520000).

25127997720 is an abundant number, since it is smaller than the sum of its proper divisors (72383042280).

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

25127997720 is a wasteful number, since it uses less digits than its factorization.

25127997720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 1111320, while the sum is 51.

The spelling of 25127997720 in words is "twenty-five billion, one hundred twenty-seven million, nine hundred ninety-seven thousand, seven hundred twenty".