25712961890 has 128 divisors (see below), whose sum is σ = 61245144576. Its totient is φ = 7524864000.

The previous prime is 25712961889. The next prime is 25712961893. The reversal of 25712961890 is 9816921752.

It is a super-2 number, since 2×25712961890² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25712961893) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 6032360 + ... + 6036620.

It is an arithmetic number, because the mean of its divisors is an integer number (478477692).

Almost surely, 2^25712961890 is an apocalyptic number.

25712961890 is an abundant number, since it is smaller than the sum of its proper divisors (35532182686).

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

25712961890 is a wasteful number, since it uses less digits than its factorization.

25712961890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4764.

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 25712961890 in words is "twenty-five billion, seven hundred twelve million, nine hundred sixty-one thousand, eight hundred ninety".