30831072 has 48 divisors (see below), whose sum is σ = 85196160. Its totient is φ = 9735552.

The previous prime is 30831071. The next prime is 30831079. The reversal of 30831072 is 27013803.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30831071) 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 7 ways as a sum of consecutive naturals, for example, 6628 + ... + 10275.

It is an arithmetic number, because the mean of its divisors is an integer number (1774920).

Almost surely, 2^30831072 is an apocalyptic number.

30831072 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

30831072 is an abundant number, since it is smaller than the sum of its proper divisors (54365088).

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

30831072 is a wasteful number, since it uses less digits than its factorization.

30831072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16935 (or 16927 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 30831072 is about 5552.5734574159. The cubic root of 30831072 is about 313.5664157774.

Adding to 30831072 its reverse (27013803), we get a palindrome (57844875).

The spelling of 30831072 in words is "thirty million, eight hundred thirty-one thousand, seventy-two".