30750720 has 384 divisors, whose sum is σ = 132088320. Its totient is φ = 5898240.

The previous prime is 30750691. The next prime is 30750743. The reversal of 30750720 is 2705703.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 2365434 + ... + 2365446.

It is an arithmetic number, because the mean of its divisors is an integer number (343980).

Almost surely, 2^30750720 is an apocalyptic number.

30750720 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 30750720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66044160).

30750720 is an abundant number, since it is smaller than the sum of its proper divisors (101337600).

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

30750720 is a wasteful number, since it uses less digits than its factorization.

30750720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 24.

The square root of 30750720 is about 5545.3331730384. Note that the first 3 decimals coincide. The cubic root of 30750720 is about 313.2937729844.

The spelling of 30750720 in words is "thirty million, seven hundred fifty thousand, seven hundred twenty".