30009978 has 48 divisors (see below), whose sum is σ = 67223520. Its totient is φ = 9670752.

The previous prime is 30009919. The next prime is 30009979. The reversal of 30009978 is 87990003.

It is not an unprimeable number, because it can be changed into a prime (30009979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78993 + ... + 79371.

It is an arithmetic number, because the mean of its divisors is an integer number (1400490).

Almost surely, 2^30009978 is an apocalyptic number.

30009978 is an abundant number, since it is smaller than the sum of its proper divisors (37213542).

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

30009978 is a wasteful number, since it uses less digits than its factorization.

30009978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 30009978 is about 5478.1363619392. The cubic root of 30009978 is about 310.7576956279.

The spelling of 30009978 in words is "thirty million, nine thousand, nine hundred seventy-eight".