25729227720 has 384 divisors, whose sum is σ = 105021360000. Its totient is φ = 5571224064.

The previous prime is 25729227673. The next prime is 25729227737. The reversal of 25729227720 is 2772292752.

25729227720 is a `hidden beast` number, since 2 + 572 + 9 + 2 + 2 + 7 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 992686 + ... + 1018274.

It is an arithmetic number, because the mean of its divisors is an integer number (273493125).

Almost surely, 2^25729227720 is an apocalyptic number.

25729227720 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 25729227720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52510680000).

25729227720 is an abundant number, since it is smaller than the sum of its proper divisors (79292132280).

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

25729227720 is a wasteful number, since it uses less digits than its factorization.

25729227720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25642 (or 25625 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 45.

The spelling of 25729227720 in words is "twenty-five billion, seven hundred twenty-nine million, two hundred twenty-seven thousand, seven hundred twenty".