30788881 has 4 divisors (see below), whose sum is σ = 32127552. Its totient is φ = 29450212.

The previous prime is 30788869. The next prime is 30788893. The reversal of 30788881 is 18888703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18888703 = 31 ⋅609313.

It is an interprime number because it is at equal distance from previous prime (30788869) and next prime (30788893).

It is a de Polignac number, because none of the positive numbers 2^k-30788881 is a prime.

It is a super-2 number, since 2×30788881² = 1895910386464322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30788801) 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 3 ways as a sum of consecutive naturals, for example, 669301 + ... + 669346.

It is an arithmetic number, because the mean of its divisors is an integer number (8031888).

Almost surely, 2^30788881 is an apocalyptic number.

It is an amenable number.

30788881 is a deficient number, since it is larger than the sum of its proper divisors (1338671).

30788881 is a wasteful number, since it uses less digits than its factorization.

30788881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338670.

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 30788881 is about 5548.7729274138. The cubic root of 30788881 is about 313.4233164176.

The spelling of 30788881 in words is "thirty million, seven hundred eighty-eight thousand, eight hundred eighty-one".