25857089820 has 36 divisors (see below), whose sum is σ = 78433173000. Its totient is φ = 6895223904.

The previous prime is 25857089761. The next prime is 25857089827. The reversal of 25857089820 is 2898075852.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25857089827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71825070 + ... + 71825429.

It is an arithmetic number, because the mean of its divisors is an integer number (2178699250).

Almost surely, 2^25857089820 is an apocalyptic number.

25857089820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25857089820 is an abundant number, since it is smaller than the sum of its proper divisors (52576083180).

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

25857089820 is a wasteful number, since it uses less digits than its factorization.

25857089820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143650514 (or 143650509 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 25857089820 in words is "twenty-five billion, eight hundred fifty-seven million, eighty-nine thousand, eight hundred twenty".