30478812 has 144 divisors (see below), whose sum is σ = 93461760. Its totient is φ = 7547904.

The previous prime is 30478759. The next prime is 30478823. The reversal of 30478812 is 21887403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 269668 + ... + 269780.

It is an arithmetic number, because the mean of its divisors is an integer number (649040).

Almost surely, 2^30478812 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 30478812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46730880).

30478812 is an abundant number, since it is smaller than the sum of its proper divisors (62982948).

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

30478812 is a wasteful number, since it uses less digits than its factorization.

30478812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 30478812 is about 5520.7619039404. The cubic root of 30478812 is about 312.3676222249.

The spelling of 30478812 in words is "thirty million, four hundred seventy-eight thousand, eight hundred twelve".