308728238 has 32 divisors (see below), whose sum is σ = 579640320. Its totient is φ = 120060000.

The previous prime is 308728201. The next prime is 308728247. The reversal of 308728238 is 832827803.

It is a junction number, because it is equal to n+sod(n) for n = 308728195 and 308728204.

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, 3638 + ... + 25113.

It is an arithmetic number, because the mean of its divisors is an integer number (18113760).

Almost surely, 2^308728238 is an apocalyptic number.

308728238 is a deficient number, since it is larger than the sum of its proper divisors (270912082).

308728238 is a wasteful number, since it uses less digits than its factorization.

308728238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28832.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 308728238 is about 17570.6641308745. The cubic root of 308728238 is about 675.8631759193.

The spelling of 308728238 in words is "three hundred eight million, seven hundred twenty-eight thousand, two hundred thirty-eight".