328189457 has 8 divisors (see below), whose sum is σ = 329653800. Its totient is φ = 326729344.

The previous prime is 328189441. The next prime is 328189481. The reversal of 328189457 is 754981823.

It is a happy number.

It is a Cunningham number, because it is equal to 18116²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 159163456 + 169026001 = 12616^2 + 13001^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 328189457 - 2⁴ = 328189441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (328189427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405269 + ... + 406077.

It is an arithmetic number, because the mean of its divisors is an integer number (41206725).

Almost surely, 2^328189457 is an apocalyptic number.

It is an amenable number.

328189457 is a deficient number, since it is larger than the sum of its proper divisors (1464343).

328189457 is an equidigital number, since it uses as much as digits as its factorization.

328189457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115.

The product of its digits is 483840, while the sum is 47.

The square root of 328189457 is about 18116.0000275999. Note that the first 4 decimals coincide. The cubic root of 328189457 is about 689.7762048146.

The spelling of 328189457 in words is "three hundred twenty-eight million, one hundred eighty-nine thousand, four hundred fifty-seven".