25700021984 has 144 divisors (see below), whose sum is σ = 65912676480. Its totient is φ = 9631664640.

The previous prime is 25700021959. The next prime is 25700022059. The reversal of 25700021984 is 48912000752.

It is a super-2 number, since 2×25700021984² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 701399 + ... + 737129.

It is an arithmetic number, because the mean of its divisors is an integer number (457726920).

Almost surely, 2^25700021984 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 25700021984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32956338240).

25700021984 is an abundant number, since it is smaller than the sum of its proper divisors (40212654496).

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

25700021984 is a wasteful number, since it uses less digits than its factorization.

25700021984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35793 (or 35772 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 25700021984 in words is "twenty-five billion, seven hundred million, twenty-one thousand, nine hundred eighty-four".