30813775 has 12 divisors (see below), whose sum is σ = 40457232. Its totient is φ = 23200640.

The previous prime is 30813743. The next prime is 30813779. The reversal of 30813775 is 57731803.

It is not a de Polignac number, because 30813775 - 2⁵ = 30813743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30813775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30813779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35827 + ... + 36676.

It is an arithmetic number, because the mean of its divisors is an integer number (3371436).

Almost surely, 2^30813775 is an apocalyptic number.

30813775 is a deficient number, since it is larger than the sum of its proper divisors (9643457).

30813775 is a wasteful number, since it uses less digits than its factorization.

30813775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72530 (or 72525 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 30813775 is about 5551.0156728296. The cubic root of 30813775 is about 313.5077652824.

The spelling of 30813775 in words is "thirty million, eight hundred thirteen thousand, seven hundred seventy-five".