81733030 has 16 divisors (see below), whose sum is σ = 153516384. Its totient is φ = 31271680.

The previous prime is 81733027. The next prime is 81733031. The reversal of 81733030 is 3033718.

It is a junction number, because it is equal to n+sod(n) for n = 81732986 and 81733004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81733031) 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, 177451 + ... + 177910.

It is an arithmetic number, because the mean of its divisors is an integer number (9594774).

Almost surely, 2^81733030 is an apocalyptic number.

81733030 is a deficient number, since it is larger than the sum of its proper divisors (71783354).

81733030 is a wasteful number, since it uses less digits than its factorization.

81733030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355391.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 81733030 is about 9040.6321681617. The cubic root of 81733030 is about 433.9761537720.

Adding to 81733030 its reverse (3033718), we get a palindrome (84766748).

The spelling of 81733030 in words is "eighty-one million, seven hundred thirty-three thousand, thirty".