309748644 has 24 divisors (see below), whose sum is σ = 803052320. Its totient is φ = 103249512.

The previous prime is 309748639. The next prime is 309748661. The reversal of 309748644 is 446847903.

309748644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 309748644.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1433914 + ... + 1434129.

Almost surely, 2^309748644 is an apocalyptic number.

It is an amenable number.

309748644 is an abundant number, since it is smaller than the sum of its proper divisors (493303676).

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

309748644 is a wasteful number, since it uses less digits than its factorization.

309748644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2868056 (or 2868048 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 309748644 is about 17599.6773834068. The cubic root of 309748644 is about 676.6069761654.

The spelling of 309748644 in words is "three hundred nine million, seven hundred forty-eight thousand, six hundred forty-four".