30705280 has 32 divisors (see below), whose sum is σ = 73406340. Its totient is φ = 12281856.

The previous prime is 30705277. The next prime is 30705293. The reversal of 30705280 is 8250703.

It can be written as a sum of positive squares in 2 ways, for example, as 27962944 + 2742336 = 5288^2 + 1656^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 23349 + ... + 24628.

Almost surely, 2^30705280 is an apocalyptic number.

It is an amenable number.

30705280 is an abundant number, since it is smaller than the sum of its proper divisors (42701060).

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

30705280 is an equidigital number, since it uses as much as digits as its factorization.

30705280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47996 (or 47984 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 30705280 is about 5541.2345194911. The cubic root of 30705280 is about 313.1393799928.

Adding to 30705280 its reverse (8250703), we get a palindrome (38955983).

The spelling of 30705280 in words is "thirty million, seven hundred five thousand, two hundred eighty".