30091768 has 64 divisors (see below), whose sum is σ = 69370560. Its totient is φ = 11943936.

The previous prime is 30091753. The next prime is 30091769. The reversal of 30091768 is 86719003.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30091769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69280 + ... + 69712.

It is an arithmetic number, because the mean of its divisors is an integer number (1083915).

Almost surely, 2^30091768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30091768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34685280).

30091768 is an abundant number, since it is smaller than the sum of its proper divisors (39278792).

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

30091768 is a wasteful number, since it uses less digits than its factorization.

30091768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 30091768 is about 5485.5964124241. The cubic root of 30091768 is about 311.0397553284.

The spelling of 30091768 in words is "thirty million, ninety-one thousand, seven hundred sixty-eight".