308128490 has 8 divisors (see below), whose sum is σ = 554631300. Its totient is φ = 123251392.

The previous prime is 308128487. The next prime is 308128531. The reversal of 308128490 is 94821803.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 295118041 + 13010449 = 17179^2 + 3607^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 308128490.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15406415 + ... + 15406434.

Almost surely, 2^308128490 is an apocalyptic number.

308128490 is a deficient number, since it is larger than the sum of its proper divisors (246502810).

308128490 is a wasteful number, since it uses less digits than its factorization.

308128490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30812856.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 308128490 is about 17553.5890916929. The cubic root of 308128490 is about 675.4252391373.

The spelling of 308128490 in words is "three hundred eight million, one hundred twenty-eight thousand, four hundred ninety".