30788249 has 4 divisors (see below), whose sum is σ = 31070820. Its totient is φ = 30505680.

The previous prime is 30788213. The next prime is 30788267. The reversal of 30788249 is 94288703.

30788249 = 262² + 263² + ... + 479².

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 15523600 + 15264649 = 3940^2 + 3907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30788249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30788209) 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, 141122 + ... + 141339.

It is an arithmetic number, because the mean of its divisors is an integer number (7767705).

Almost surely, 2^30788249 is an apocalyptic number.

It is an amenable number.

30788249 is a deficient number, since it is larger than the sum of its proper divisors (282571).

30788249 is a wasteful number, since it uses less digits than its factorization.

30788249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282570.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 30788249 is about 5548.7159775934. The cubic root of 30788249 is about 313.4211718676.

The spelling of 30788249 in words is "thirty million, seven hundred eighty-eight thousand, two hundred forty-nine".