30661140 has 24 divisors (see below), whose sum is σ = 85851360. Its totient is φ = 8176288.

The previous prime is 30661109. The next prime is 30661151. The reversal of 30661140 is 4116603.

It is a congruent number.

It is an unprimeable number.

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, 255450 + ... + 255569.

It is an arithmetic number, because the mean of its divisors is an integer number (3577140).

Almost surely, 2^30661140 is an apocalyptic number.

30661140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30661140 is an abundant number, since it is smaller than the sum of its proper divisors (55190220).

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

30661140 is a wasteful number, since it uses less digits than its factorization.

30661140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511031 (or 511029 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 30661140 is about 5537.2502201002. The cubic root of 30661140 is about 312.9892581383.

Adding to 30661140 its reverse (4116603), we get a palindrome (34777743).

The spelling of 30661140 in words is "thirty million, six hundred sixty-one thousand, one hundred forty".