30868736 has 72 divisors (see below), whose sum is σ = 67218984. Its totient is φ = 14090240.

The previous prime is 30868723. The next prime is 30868757. The reversal of 30868736 is 63786803.

It can be written as a sum of positive squares in 4 ways, for example, as 7054336 + 23814400 = 2656^2 + 4880^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 30868693 and 30868702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178346 + ... + 178518.

It is an arithmetic number, because the mean of its divisors is an integer number (933597).

Almost surely, 2^30868736 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 30868736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33609492).

30868736 is an abundant number, since it is smaller than the sum of its proper divisors (36350248).

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

30868736 is a wasteful number, since it uses less digits than its factorization.

30868736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 30868736 is about 5555.9640027632. The cubic root of 30868736 is about 313.6940506468.

The spelling of 30868736 in words is "thirty million, eight hundred sixty-eight thousand, seven hundred thirty-six".