30684978 has 48 divisors (see below), whose sum is σ = 69328896. Its totient is φ = 9797760.

The previous prime is 30684961. The next prime is 30685003. The reversal of 30684978 is 87948603.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70650 + ... + 71082.

It is an arithmetic number, because the mean of its divisors is an integer number (1444352).

Almost surely, 2^30684978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30684978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34664448).

30684978 is an abundant number, since it is smaller than the sum of its proper divisors (38643918).

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

30684978 is a wasteful number, since it uses less digits than its factorization.

30684978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599 (or 596 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 30684978 is about 5539.4023143296. The cubic root of 30684978 is about 313.0703499829.

The spelling of 30684978 in words is "thirty million, six hundred eighty-four thousand, nine hundred seventy-eight".