30993750 has 144 divisors (see below), whose sum is σ = 91400400. Its totient is φ = 7560000.

The previous prime is 30993749. The next prime is 30993763. The reversal of 30993750 is 5739903.

It is a super-2 number, since 2×30993750² = 1921225078125000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1068736 + ... + 1068764.

It is an arithmetic number, because the mean of its divisors is an integer number (634725).

Almost surely, 2^30993750 is an apocalyptic number.

30993750 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30993750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45700200).

30993750 is an abundant number, since it is smaller than the sum of its proper divisors (60406650).

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

30993750 is a wasteful number, since it uses less digits than its factorization.

30993750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 25515, while the sum is 36.

The square root of 30993750 is about 5567.2030679687. The cubic root of 30993750 is about 314.1169523911.

The spelling of 30993750 in words is "thirty million, nine hundred ninety-three thousand, seven hundred fifty".