328400551 has 4 divisors (see below), whose sum is σ = 332557600. Its totient is φ = 324243504.

The previous prime is 328400533. The next prime is 328400557. The reversal of 328400551 is 155004823.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 328400551 - 2⁵ = 328400519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328400557) 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, 2078406 + ... + 2078563.

It is an arithmetic number, because the mean of its divisors is an integer number (83139400).

Almost surely, 2^328400551 is an apocalyptic number.

328400551 is a deficient number, since it is larger than the sum of its proper divisors (4157049).

328400551 is an equidigital number, since it uses as much as digits as its factorization.

328400551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157048.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 328400551 is about 18121.8252667881. The cubic root of 328400551 is about 689.9240629167.

The spelling of 328400551 in words is "three hundred twenty-eight million, four hundred thousand, five hundred fifty-one".