30278816 has 48 divisors (see below), whose sum is σ = 62270208. Its totient is φ = 14476800.

The previous prime is 30278803. The next prime is 30278861. The reversal of 30278816 is 61887203.

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, 129836 + ... + 130068.

It is an arithmetic number, because the mean of its divisors is an integer number (1297296).

Almost surely, 2^30278816 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 30278816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31135104).

30278816 is an abundant number, since it is smaller than the sum of its proper divisors (31991392).

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

30278816 is a wasteful number, since it uses less digits than its factorization.

30278816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 30278816 is about 5502.6190127975. The cubic root of 30278816 is about 311.6828906053.

The spelling of 30278816 in words is "thirty million, two hundred seventy-eight thousand, eight hundred sixteen".