30885840 has 160 divisors (see below), whose sum is σ = 108326400. Its totient is φ = 8087040.

The previous prime is 30885817. The next prime is 30885853. The reversal of 30885840 is 4858803.

It is a super-2 number, since 2×30885840² = 1907870225011200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 30885795 and 30885804.

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, 170550 + ... + 170730.

It is an arithmetic number, because the mean of its divisors is an integer number (677040).

Almost surely, 2^30885840 is an apocalyptic number.

30885840 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 30885840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54163200).

30885840 is an abundant number, since it is smaller than the sum of its proper divisors (77440560).

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

30885840 is a wasteful number, since it uses less digits than its factorization.

30885840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 30885840 is about 5557.5030364364. The cubic root of 30885840 is about 313.7519779985.

The spelling of 30885840 in words is "thirty million, eight hundred eighty-five thousand, eight hundred forty".