307688445 has 12 divisors (see below), whose sum is σ = 533326716. Its totient is φ = 164100480.

The previous prime is 307688441. The next prime is 307688467. The reversal of 307688445 is 544886703.

It can be written as a sum of positive squares in 2 ways, for example, as 110061081 + 197627364 = 10491^2 + 14058^2 .

It is not a de Polignac number, because 307688445 - 2² = 307688441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 6837521 = 307688445 / (3 + 0 + 7 + 6 + 8 + 8 + 4 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 307688445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307688441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3418716 + ... + 3418805.

It is an arithmetic number, because the mean of its divisors is an integer number (44443893).

Almost surely, 2^307688445 is an apocalyptic number.

It is an amenable number.

307688445 is a deficient number, since it is larger than the sum of its proper divisors (225638271).

307688445 is a wasteful number, since it uses less digits than its factorization.

307688445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837532 (or 6837529 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 307688445 is about 17541.0502821239. The cubic root of 307688445 is about 675.1035561284.

The spelling of 307688445 in words is "three hundred seven million, six hundred eighty-eight thousand, four hundred forty-five".