309664445 has 16 divisors (see below), whose sum is σ = 375252528. Its totient is φ = 245306880.

The previous prime is 309664429. The next prime is 309664463. The reversal of 309664445 is 544466903.

It can be written as a sum of positive squares in 8 ways, for example, as 163302841 + 146361604 = 12779^2 + 12098^2 .

It is not a de Polignac number, because 309664445 - 2⁴ = 309664429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330017 + ... + 330953.

It is an arithmetic number, because the mean of its divisors is an integer number (23453283).

Almost surely, 2^309664445 is an apocalyptic number.

It is an amenable number.

309664445 is a deficient number, since it is larger than the sum of its proper divisors (65588083).

309664445 is a wasteful number, since it uses less digits than its factorization.

309664445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520.

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 309664445 is about 17597.2851599331. The cubic root of 309664445 is about 676.5456632324.

The spelling of 309664445 in words is "three hundred nine million, six hundred sixty-four thousand, four hundred forty-five".