30817872 has 60 divisors (see below), whose sum is σ = 91327860. Its totient is φ = 9667584.

The previous prime is 30817859. The next prime is 30817873. The reversal of 30817872 is 27871803.

It can be written as a sum of positive squares in 2 ways, for example, as 12362256 + 18455616 = 3516^2 + 4296^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30817873) 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 11 ways as a sum of consecutive naturals, for example, 3847 + ... + 8742.

It is an arithmetic number, because the mean of its divisors is an integer number (1522131).

Almost surely, 2^30817872 is an apocalyptic number.

It is an amenable number.

30817872 is an abundant number, since it is smaller than the sum of its proper divisors (60509988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30817872 is a wasteful number, since it uses less digits than its factorization.

30817872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12620 (or 12611 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 30817872 is about 5551.3846921286. The cubic root of 30817872 is about 313.5216593324.

The spelling of 30817872 in words is "thirty million, eight hundred seventeen thousand, eight hundred seventy-two".