81369030 has 32 divisors (see below), whose sum is σ = 195973344. Its totient is φ = 21622016.

The previous prime is 81369019. The next prime is 81369047. The reversal of 81369030 is 3096318.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4162 + ... + 13418.

It is an arithmetic number, because the mean of its divisors is an integer number (6124167).

Almost surely, 2^81369030 is an apocalyptic number.

81369030 is an abundant number, since it is smaller than the sum of its proper divisors (114604314).

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

81369030 is a wasteful number, since it uses less digits than its factorization.

81369030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 81369030 is about 9020.4783686898. The cubic root of 81369030 is about 433.3309539646.

The spelling of 81369030 in words is "eighty-one million, three hundred sixty-nine thousand, thirty".