30693681 has 16 divisors (see below), whose sum is σ = 45558400. Its totient is φ = 20423664.

The previous prime is 30693647. The next prime is 30693713. The reversal of 30693681 is 18639603.

It is a happy number.

It is not a de Polignac number, because 30693681 - 2¹⁸ = 30431537 is a prime.

It is a super-2 number, since 2×30693681² = 1884204106659522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30693581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24195 + ... + 25431.

It is an arithmetic number, because the mean of its divisors is an integer number (2847400).

Almost surely, 2^30693681 is an apocalyptic number.

It is an amenable number.

30693681 is a deficient number, since it is larger than the sum of its proper divisors (14864719).

30693681 is a wasteful number, since it uses less digits than its factorization.

30693681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165 (or 2159 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 30693681 is about 5540.1878127009. The cubic root of 30693681 is about 313.0999452863.

The spelling of 30693681 in words is "thirty million, six hundred ninety-three thousand, six hundred eighty-one".