81603030 has 16 divisors (see below), whose sum is σ = 195847344. Its totient is φ = 21760800.

The previous prime is 81603029. The next prime is 81603037. The reversal of 81603030 is 3030618.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81602988 and 81603006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81603037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1360021 + ... + 1360080.

It is an arithmetic number, because the mean of its divisors is an integer number (12240459).

Almost surely, 2^81603030 is an apocalyptic number.

81603030 is an abundant number, since it is smaller than the sum of its proper divisors (114244314).

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

81603030 is a wasteful number, since it uses less digits than its factorization.

81603030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720111.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 81603030 is about 9033.4395442711. The cubic root of 81603030 is about 433.7459455863.

Adding to 81603030 its reverse (3030618), we get a palindrome (84633648).

The spelling of 81603030 in words is "eighty-one million, six hundred three thousand, thirty".