307728538 has 8 divisors (see below), whose sum is σ = 497099988. Its totient is φ = 142028544.

The previous prime is 307728529. The next prime is 307728539. The reversal of 307728538 is 835827703.

It can be written as a sum of positive squares in 2 ways, for example, as 302516449 + 5212089 = 17393^2 + 2283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 307728494 and 307728503.

It is not an unprimeable number, because it can be changed into a prime (307728539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5917831 + ... + 5917882.

Almost surely, 2^307728538 is an apocalyptic number.

307728538 is a deficient number, since it is larger than the sum of its proper divisors (189371450).

307728538 is a wasteful number, since it uses less digits than its factorization.

307728538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11835728.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 307728538 is about 17542.1930784039. The cubic root of 307728538 is about 675.1328777271.

The spelling of 307728538 in words is "three hundred seven million, seven hundred twenty-eight thousand, five hundred thirty-eight".