30685445 has 16 divisors (see below), whose sum is σ = 43063680. Its totient is φ = 20551104.

The previous prime is 30685441. The next prime is 30685453. The reversal of 30685445 is 54458603.

It is not a de Polignac number, because 30685445 - 2² = 30685441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30685441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8690 + ... + 11699.

It is an arithmetic number, because the mean of its divisors is an integer number (2691480).

Almost surely, 2^30685445 is an apocalyptic number.

30685445 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30685445 is a deficient number, since it is larger than the sum of its proper divisors (12378235).

30685445 is a wasteful number, since it uses less digits than its factorization.

30685445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20444.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 30685445 is about 5539.4444667313. Note that the first 4 decimals coincide. The cubic root of 30685445 is about 313.0719381988.

The spelling of 30685445 in words is "thirty million, six hundred eighty-five thousand, four hundred forty-five".