81850030 has 16 divisors (see below), whose sum is σ = 150465600. Its totient is φ = 32043232.

The previous prime is 81849997. The next prime is 81850033. The reversal of 81850030 is 3005818.

It is a super-2 number, since 2×81850030² = 13398854822001800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81849977 and 81850004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81850033) 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, 86605 + ... + 87544.

It is an arithmetic number, because the mean of its divisors is an integer number (9404100).

Almost surely, 2^81850030 is an apocalyptic number.

81850030 is a deficient number, since it is larger than the sum of its proper divisors (68615570).

81850030 is a wasteful number, since it uses less digits than its factorization.

81850030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174203.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 81850030 is about 9047.1006405367. The cubic root of 81850030 is about 434.1831325221.

Adding to 81850030 its reverse (3005818), we get a palindrome (84855848).

The spelling of 81850030 in words is "eighty-one million, eight hundred fifty thousand, thirty".