81730694 has 16 divisors (see below), whose sum is σ = 128701440. Its totient is φ = 38875080.

The previous prime is 81730673. The next prime is 81730699. The reversal of 81730694 is 49603718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81730699) 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, 7514 + ... + 14829.

It is an arithmetic number, because the mean of its divisors is an integer number (8043840).

Almost surely, 2^81730694 is an apocalyptic number.

81730694 is a deficient number, since it is larger than the sum of its proper divisors (46970746).

81730694 is a wasteful number, since it uses less digits than its factorization.

81730694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22435.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 81730694 is about 9040.5029727333. The cubic root of 81730694 is about 433.9720192626.

The spelling of 81730694 in words is "eighty-one million, seven hundred thirty thousand, six hundred ninety-four".