30720851 has 8 divisors (see below), whose sum is σ = 35149920. Its totient is φ = 26301888.

The previous prime is 30720803. The next prime is 30720857. The reversal of 30720851 is 15802703.

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

It is a cyclic number.

It is not a de Polignac number, because 30720851 - 2¹⁸ = 30458707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30720851.

It is not an unprimeable number, because it can be changed into a prime (30720857) 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 7 ways as a sum of consecutive naturals, for example, 5855 + ... + 9783.

It is an arithmetic number, because the mean of its divisors is an integer number (4393740).

Almost surely, 2^30720851 is an apocalyptic number.

30720851 is a deficient number, since it is larger than the sum of its proper divisors (4429069).

30720851 is a wasteful number, since it uses less digits than its factorization.

30720851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5053.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 30720851 is about 5542.6393532324. The cubic root of 30720851 is about 313.1923032393.

The spelling of 30720851 in words is "thirty million, seven hundred twenty thousand, eight hundred fifty-one".