1328356457 has 4 divisors (see below), whose sum is σ = 1328839296. Its totient is φ = 1327873620.

The previous prime is 1328356429. The next prime is 1328356487. The reversal of 1328356457 is 7546538231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7546538231 = 2221 ⋅3397811.

It is a cyclic number.

It is not a de Polignac number, because 1328356457 - 2¹⁴ = 1328340073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328356487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237269 + ... + 242802.

It is an arithmetic number, because the mean of its divisors is an integer number (332209824).

Almost surely, 2^1328356457 is an apocalyptic number.

It is an amenable number.

1328356457 is a deficient number, since it is larger than the sum of its proper divisors (482839).

1328356457 is an equidigital number, since it uses as much as digits as its factorization.

1328356457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482838.

The product of its digits is 604800, while the sum is 44.

The square root of 1328356457 is about 36446.6247682827. The cubic root of 1328356457 is about 1099.2712685740.

The spelling of 1328356457 in words is "one billion, three hundred twenty-eight million, three hundred fifty-six thousand, four hundred fifty-seven".