30805780 has 12 divisors (see below), whose sum is σ = 64692180. Its totient is φ = 12322304.

The previous prime is 30805771. The next prime is 30805807. The reversal of 30805780 is 8750803.

It can be written as a sum of positive squares in 2 ways, for example, as 4056196 + 26749584 = 2014^2 + 5172^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770125 + ... + 770164.

It is an arithmetic number, because the mean of its divisors is an integer number (5391015).

Almost surely, 2^30805780 is an apocalyptic number.

It is an amenable number.

30805780 is an abundant number, since it is smaller than the sum of its proper divisors (33886400).

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

30805780 is a wasteful number, since it uses less digits than its factorization.

30805780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540298 (or 1540296 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 30805780 is about 5550.2954876295. The cubic root of 30805780 is about 313.4806484990.

The spelling of 30805780 in words is "thirty million, eight hundred five thousand, seven hundred eighty".