81889230450 has 24 divisors (see below), whose sum is σ = 203085291888. Its totient is φ = 21837128080.

The previous prime is 81889230421. The next prime is 81889230541. The reversal of 81889230450 is 5403298818.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81889230450.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 272963952 + ... + 272964251.

It is an arithmetic number, because the mean of its divisors is an integer number (8461887162).

Almost surely, 2^81889230450 is an apocalyptic number.

81889230450 is an abundant number, since it is smaller than the sum of its proper divisors (121196061438).

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

81889230450 is a wasteful number, since it uses less digits than its factorization.

81889230450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545928218 (or 545928213 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 81889230450 in words is "eighty-one billion, eight hundred eighty-nine million, two hundred thirty thousand, four hundred fifty".