30491136 has 120 divisors (see below), whose sum is σ = 94954860. Its totient is φ = 9363456.

The previous prime is 30491113. The next prime is 30491137. The reversal of 30491136 is 63119403.

It can be written as a sum of positive squares in 2 ways, for example, as 30470400 + 20736 = 5520^2 + 144^2 .

It is not an unprimeable number, because it can be changed into a prime (30491137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59650 + ... + 60158.

Almost surely, 2^30491136 is an apocalyptic number.

30491136 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30491136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47477430).

30491136 is an abundant number, since it is smaller than the sum of its proper divisors (64463724).

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

30491136 is a wasteful number, since it uses less digits than its factorization.

30491136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 30491136 is about 5521.8779414254. The cubic root of 30491136 is about 312.4097181332.

The spelling of 30491136 in words is "thirty million, four hundred ninety-one thousand, one hundred thirty-six".