30866640 has 160 divisors (see below), whose sum is σ = 115230720. Its totient is φ = 6676992.

The previous prime is 30866609. The next prime is 30866651. The reversal of 30866640 is 4666803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31437 + ... + 32403.

It is an arithmetic number, because the mean of its divisors is an integer number (720192).

Almost surely, 2^30866640 is an apocalyptic number.

30866640 is a gapful number since it is divisible by the number (30) 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 30866640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57615360).

30866640 is an abundant number, since it is smaller than the sum of its proper divisors (84364080).

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

30866640 is a wasteful number, since it uses less digits than its factorization.

30866640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 30866640 is about 5555.7753734290. The cubic root of 30866640 is about 313.6869505007.

The spelling of 30866640 in words is "thirty million, eight hundred sixty-six thousand, six hundred forty".