328781143 has 4 divisors (see below), whose sum is σ = 328858600. Its totient is φ = 328703688.

The previous prime is 328781107. The next prime is 328781171. The reversal of 328781143 is 341187823.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341187823 = 61 ⋅5593243.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328781143 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 (328781743) 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, 31968 + ... + 40981.

It is an arithmetic number, because the mean of its divisors is an integer number (82214650).

Almost surely, 2^328781143 is an apocalyptic number.

328781143 is a deficient number, since it is larger than the sum of its proper divisors (77457).

328781143 is an equidigital number, since it uses as much as digits as its factorization.

328781143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77456.

The product of its digits is 32256, while the sum is 37.

The square root of 328781143 is about 18132.3231550731. The cubic root of 328781143 is about 690.1904837115.

The spelling of 328781143 in words is "three hundred twenty-eight million, seven hundred eighty-one thousand, one hundred forty-three".