30681532 has 48 divisors (see below), whose sum is σ = 66528000. Its totient is φ = 12079872.

The previous prime is 30681509. The next prime is 30681533. The reversal of 30681532 is 23518603.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 30681532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30681533) 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 15 ways as a sum of consecutive naturals, for example, 19719 + ... + 21217.

It is an arithmetic number, because the mean of its divisors is an integer number (1386000).

Almost surely, 2^30681532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30681532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33264000).

30681532 is an abundant number, since it is smaller than the sum of its proper divisors (35846468).

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

30681532 is a wasteful number, since it uses less digits than its factorization.

30681532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570 (or 1568 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 30681532 is about 5539.0912612088. The cubic root of 30681532 is about 313.0586300156.

It can be divided in two parts, 30681 and 532, that added together give a palindrome (31213).

The spelling of 30681532 in words is "thirty million, six hundred eighty-one thousand, five hundred thirty-two".