81920030 has 8 divisors (see below), whose sum is σ = 147456072. Its totient is φ = 32768008.

The previous prime is 81920023. The next prime is 81920053. The reversal of 81920030 is 3002918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81919978 and 81920005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4095992 + ... + 4096011.

It is an arithmetic number, because the mean of its divisors is an integer number (18432009).

Almost surely, 2^81920030 is an apocalyptic number.

81920030 is a deficient number, since it is larger than the sum of its proper divisors (65536042).

81920030 is a wasteful number, since it uses less digits than its factorization.

81920030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8192010.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 81920030 is about 9050.9684564692. The cubic root of 81920030 is about 434.3068716711.

Adding to 81920030 its reverse (3002918), we get a palindrome (84922948).

The spelling of 81920030 in words is "eighty-one million, nine hundred twenty thousand, thirty".