30813890 has 8 divisors (see below), whose sum is σ = 55465020. Its totient is φ = 12325552.

The previous prime is 30813841. The next prime is 30813901. The reversal of 30813890 is 9831803.

It can be written as a sum of positive squares in 2 ways, for example, as 30813601 + 289 = 5551^2 + 17^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1540685 + ... + 1540704.

Almost surely, 2^30813890 is an apocalyptic number.

30813890 is a deficient number, since it is larger than the sum of its proper divisors (24651130).

30813890 is a wasteful number, since it uses less digits than its factorization.

30813890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081396.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 30813890 is about 5551.0260312847. The cubic root of 30813890 is about 313.5081552958.

The spelling of 30813890 in words is "thirty million, eight hundred thirteen thousand, eight hundred ninety".