30693978 has 40 divisors (see below), whose sum is σ = 78605472. Its totient is φ = 8769384.

The previous prime is 30693967. The next prime is 30694007. The reversal of 30693978 is 87939603.

It is a happy number.

It is a Curzon 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 19 ways as a sum of consecutive naturals, for example, 12400 + ... + 14667.

Almost surely, 2^30693978 is an apocalyptic number.

30693978 is an abundant number, since it is smaller than the sum of its proper divisors (47911494).

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

30693978 is a wasteful number, since it uses less digits than its factorization.

30693978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27088 (or 27079 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 30693978 is about 5540.2146167816. The cubic root of 30693978 is about 313.1009551618.

The spelling of 30693978 in words is "thirty million, six hundred ninety-three thousand, nine hundred seventy-eight".