30750840 has 80 divisors (see below), whose sum is σ = 103367880. Its totient is φ = 8199360.

The previous prime is 30750827. The next prime is 30750847. The reversal of 30750840 is 4805703.

It is a super-2 number, since 2×30750840² = 1891228321411200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30750847) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 1506 + ... + 7985.

Almost surely, 2^30750840 is an apocalyptic number.

30750840 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 30750840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51683940).

30750840 is an abundant number, since it is smaller than the sum of its proper divisors (72617040).

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

30750840 is a wasteful number, since it uses less digits than its factorization.

30750840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9514 (or 9501 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 30750840 is about 5545.3439929368. The cubic root of 30750840 is about 313.2941805110.

The spelling of 30750840 in words is "thirty million, seven hundred fifty thousand, eight hundred forty".