305193640 has 16 divisors (see below), whose sum is σ = 686685780. Its totient is φ = 122077440.

The previous prime is 305193613. The next prime is 305193641. The reversal of 305193640 is 46391503.

It can be written as a sum of positive squares in 2 ways, for example, as 274034916 + 31158724 = 16554^2 + 5582^2 .

It is not an unprimeable number, because it can be changed into a prime (305193641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3814881 + ... + 3814960.

Almost surely, 2^305193640 is an apocalyptic number.

It is an amenable number.

305193640 is an abundant number, since it is smaller than the sum of its proper divisors (381492140).

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

305193640 is a wasteful number, since it uses less digits than its factorization.

305193640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7629852 (or 7629848 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 305193640 is about 17469.7922139904. The cubic root of 305193640 is about 673.2739733531.

The spelling of 305193640 in words is "three hundred five million, one hundred ninety-three thousand, six hundred forty".