81600730 has 16 divisors (see below), whose sum is σ = 147705120. Its totient is φ = 32457232.

The previous prime is 81600719. The next prime is 81600781. The reversal of 81600730 is 3700618.

It is a junction number, because it is equal to n+sod(n) for n = 81600695 and 81600704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21004 + ... + 24583.

It is an arithmetic number, because the mean of its divisors is an integer number (9231570).

Almost surely, 2^81600730 is an apocalyptic number.

81600730 is a deficient number, since it is larger than the sum of its proper divisors (66104390).

81600730 is a wasteful number, since it uses less digits than its factorization.

81600730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45773.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 81600730 is about 9033.3122385978. The cubic root of 81600730 is about 433.7418704719.

The spelling of 81600730 in words is "eighty-one million, six hundred thousand, seven hundred thirty".