30691998 has 12 divisors (see below), whose sum is σ = 66499368. Its totient is φ = 10230660.

The previous prime is 30691979. The next prime is 30692003. The reversal of 30691998 is 89919603.

It is a Curzon 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 5 ways as a sum of consecutive naturals, for example, 852538 + ... + 852573.

It is an arithmetic number, because the mean of its divisors is an integer number (5541614).

Almost surely, 2^30691998 is an apocalyptic number.

30691998 is an abundant number, since it is smaller than the sum of its proper divisors (35807370).

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

30691998 is a wasteful number, since it uses less digits than its factorization.

30691998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705119 (or 1705116 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 30691998 is about 5540.0359204612. The cubic root of 30691998 is about 313.0942225358.

The spelling of 30691998 in words is "thirty million, six hundred ninety-one thousand, nine hundred ninety-eight".