81916030 has 64 divisors (see below), whose sum is σ = 187868160. Its totient is φ = 25035264.

The previous prime is 81916027. The next prime is 81916031. The reversal of 81916030 is 3061918.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81916030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81916031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20799 + ... + 24421.

It is an arithmetic number, because the mean of its divisors is an integer number (2935440).

Almost surely, 2^81916030 is an apocalyptic number.

81916030 is an abundant number, since it is smaller than the sum of its proper divisors (105952130).

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

81916030 is a wasteful number, since it uses less digits than its factorization.

81916030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 81916030 is about 9050.7474829431. The cubic root of 81916030 is about 434.2998027619.

Adding to 81916030 its reverse (3061918), we get a palindrome (84977948).

The spelling of 81916030 in words is "eighty-one million, nine hundred sixteen thousand, thirty".