30685769 has 4 divisors (see below), whose sum is σ = 31106196. Its totient is φ = 30265344.

The previous prime is 30685763. The next prime is 30685777. The reversal of 30685769 is 96758603.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6822544 + 23863225 = 2612^2 + 4885^2 .

It is a cyclic number.

It is not a de Polignac number, because 30685769 - 2²⁰ = 29637193 is a prime.

It is a super-2 number, since 2×30685769² = 1883232838242722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30685763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210104 + ... + 210249.

It is an arithmetic number, because the mean of its divisors is an integer number (7776549).

Almost surely, 2^30685769 is an apocalyptic number.

It is an amenable number.

30685769 is a deficient number, since it is larger than the sum of its proper divisors (420427).

30685769 is an equidigital number, since it uses as much as digits as its factorization.

30685769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420426.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 30685769 is about 5539.4737114639. The cubic root of 30685769 is about 313.0730400779.

The spelling of 30685769 in words is "thirty million, six hundred eighty-five thousand, seven hundred sixty-nine".