30878712 has 64 divisors (see below), whose sum is σ = 87264000. Its totient is φ = 10114272.

The previous prime is 30878669. The next prime is 30878713. The reversal of 30878712 is 21787803.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30878713) 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, 11533 + ... + 13955.

It is an arithmetic number, because the mean of its divisors is an integer number (1363500).

Almost surely, 2^30878712 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 30878712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43632000).

30878712 is an abundant number, since it is smaller than the sum of its proper divisors (56385288).

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

30878712 is a wasteful number, since it uses less digits than its factorization.

30878712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497 (or 2487 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 30878712 is about 5556.8617042356. The cubic root of 30878712 is about 313.7278396860.

Subtracting from 30878712 its reverse (21787803), we obtain a palindrome (9090909).

The spelling of 30878712 in words is "thirty million, eight hundred seventy-eight thousand, seven hundred twelve".