30978798 has 16 divisors (see below), whose sum is σ = 62077440. Its totient is φ = 10306296.

The previous prime is 30978767. The next prime is 30978799. The reversal of 30978798 is 89787903.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 30978798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30978799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1438 + ... + 8001.

It is an arithmetic number, because the mean of its divisors is an integer number (3879840).

Almost surely, 2^30978798 is an apocalyptic number.

30978798 is an abundant number, since it is smaller than the sum of its proper divisors (31098642).

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

30978798 is a wasteful number, since it uses less digits than its factorization.

30978798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9991.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 30978798 is about 5565.8600413593. The cubic root of 30978798 is about 314.0664321826.

The spelling of 30978798 in words is "thirty million, nine hundred seventy-eight thousand, seven hundred ninety-eight".