30780561 has 32 divisors (see below), whose sum is σ = 48660480. Its totient is φ = 16942464.

The previous prime is 30780527. The next prime is 30780587. The reversal of 30780561 is 16508703.

It is not a de Polignac number, because 30780561 - 2¹⁴ = 30764177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30780521) 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 31 ways as a sum of consecutive naturals, for example, 80176 + ... + 80558.

It is an arithmetic number, because the mean of its divisors is an integer number (1520640).

Almost surely, 2^30780561 is an apocalyptic number.

It is an amenable number.

30780561 is a deficient number, since it is larger than the sum of its proper divisors (17879919).

30780561 is a wasteful number, since it uses less digits than its factorization.

30780561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 30780561 is about 5548.0231614513. The cubic root of 30780561 is about 313.3950820158.

The spelling of 30780561 in words is "thirty million, seven hundred eighty thousand, five hundred sixty-one".