30681805 has 16 divisors (see below), whose sum is σ = 45903744. Its totient is φ = 19126080.

The previous prime is 30681773. The next prime is 30681809. The reversal of 30681805 is 50818603.

It is not a de Polignac number, because 30681805 - 2⁵ = 30681773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30681809) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 39462 + ... + 40231.

It is an arithmetic number, because the mean of its divisors is an integer number (2868984).

Almost surely, 2^30681805 is an apocalyptic number.

30681805 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30681805 is a deficient number, since it is larger than the sum of its proper divisors (15221939).

30681805 is a wasteful number, since it uses less digits than its factorization.

30681805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79716.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 30681805 is about 5539.1159041854. The cubic root of 30681805 is about 313.0595585303.

The spelling of 30681805 in words is "thirty million, six hundred eighty-one thousand, eight hundred five".