81258281892 has 48 divisors (see below), whose sum is σ = 210733022080. Its totient is φ = 27077942304.

The previous prime is 81258281887. The next prime is 81258281899. The reversal of 81258281892 is 29818285218.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (81258281899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252753 + ... + 475815.

Almost surely, 2^81258281892 is an apocalyptic number.

It is an amenable number.

81258281892 is an abundant number, since it is smaller than the sum of its proper divisors (129474740188).

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

81258281892 is a wasteful number, since it uses less digits than its factorization.

81258281892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226449 (or 226441 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 54.

The spelling of 81258281892 in words is "eighty-one billion, two hundred fifty-eight million, two hundred eighty-one thousand, eight hundred ninety-two".