81489030 has 64 divisors (see below), whose sum is σ = 227335680. Its totient is φ = 18307584.

The previous prime is 81489029. The next prime is 81489077. The reversal of 81489030 is 3098418.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81488982 and 81489000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9102 + ... + 15678.

It is an arithmetic number, because the mean of its divisors is an integer number (3552120).

Almost surely, 2^81489030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81489030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113667840).

81489030 is an abundant number, since it is smaller than the sum of its proper divisors (145846650).

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

81489030 is a wasteful number, since it uses less digits than its factorization.

81489030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6653.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81489030 is about 9027.1274500807. The cubic root of 81489030 is about 433.5438694231.

The spelling of 81489030 in words is "eighty-one million, four hundred eighty-nine thousand, thirty".