1828728291 has 8 divisors (see below), whose sum is σ = 2625866320. Its totient is φ = 1125371232.

The previous prime is 1828728281. The next prime is 1828728299. The reversal of 1828728291 is 1928278281.

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

It is a de Polignac number, because none of the positive numbers 2^k-1828728291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1828728291.

It is not an unprimeable number, because it can be changed into a prime (1828728299) 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, 23445196 + ... + 23445273.

It is an arithmetic number, because the mean of its divisors is an integer number (328233290).

Almost surely, 2^1828728291 is an apocalyptic number.

1828728291 is a deficient number, since it is larger than the sum of its proper divisors (797138029).

1828728291 is a wasteful number, since it uses less digits than its factorization.

1828728291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46890485.

The product of its digits is 258048, while the sum is 48.

The square root of 1828728291 is about 42763.6328087313. The cubic root of 1828728291 is about 1222.8778007723.

The spelling of 1828728291 in words is "one billion, eight hundred twenty-eight million, seven hundred twenty-eight thousand, two hundred ninety-one".