25721452008 has 480 divisors, whose sum is σ = 88090329600. Its totient is φ = 6756825600.

The previous prime is 25721451991. The next prime is 25721452051. The reversal of 25721452008 is 80025412752.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 134667193 + ... + 134667383.

It is an arithmetic number, because the mean of its divisors is an integer number (183521520).

Almost surely, 2^25721452008 is an apocalyptic number.

25721452008 is a gapful number since it is divisible by the number (28) 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 25721452008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44045164800).

25721452008 is an abundant number, since it is smaller than the sum of its proper divisors (62368877592).

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

25721452008 is a wasteful number, since it uses less digits than its factorization.

25721452008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 25721452008 in words is "twenty-five billion, seven hundred twenty-one million, four hundred fifty-two thousand, eight".