30782940 has 48 divisors (see below), whose sum is σ = 86835840. Its totient is φ = 8147520.

The previous prime is 30782929. The next prime is 30782951. The reversal of 30782940 is 4928703.

It is an interprime number because it is at equal distance from previous prime (30782929) and next prime (30782951).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6495 + ... + 10185.

It is an arithmetic number, because the mean of its divisors is an integer number (1809080).

Almost surely, 2^30782940 is an apocalyptic number.

30782940 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 30782940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43417920).

30782940 is an abundant number, since it is smaller than the sum of its proper divisors (56052900).

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

30782940 is a wasteful number, since it uses less digits than its factorization.

30782940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3842 (or 3840 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 30782940 is about 5548.2375579998. The cubic root of 30782940 is about 313.4031558094.

The spelling of 30782940 in words is "thirty million, seven hundred eighty-two thousand, nine hundred forty".