30978650 has 12 divisors (see below), whose sum is σ = 57620382. Its totient is φ = 12391440.

The previous prime is 30978643. The next prime is 30978653. The reversal of 30978650 is 5687903.

It can be written as a sum of positive squares in 3 ways, for example, as 19193161 + 11785489 = 4381^2 + 3433^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (30978653) by changing a digit.

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, 309737 + ... + 309836.

Almost surely, 2^30978650 is an apocalyptic number.

30978650 is a deficient number, since it is larger than the sum of its proper divisors (26641732).

30978650 is a wasteful number, since it uses less digits than its factorization.

30978650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619585 (or 619580 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 30978650 is about 5565.8467460037. The cubic root of 30978650 is about 314.0659320351.

The spelling of 30978650 in words is "thirty million, nine hundred seventy-eight thousand, six hundred fifty".