1028677821 has 16 divisors (see below), whose sum is σ = 1438311360. Its totient is φ = 653063040.

The previous prime is 1028677817. The next prime is 1028677883. The reversal of 1028677821 is 1287768201.

1028677821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1028677821 - 2² = 1028677817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028677801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74635 + ... + 87336.

It is an arithmetic number, because the mean of its divisors is an integer number (89894460).

Almost surely, 2^1028677821 is an apocalyptic number.

It is an amenable number.

1028677821 is a deficient number, since it is larger than the sum of its proper divisors (409633539).

1028677821 is a wasteful number, since it uses less digits than its factorization.

1028677821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162076.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 1028677821 is about 32073.0076700019. The cubic root of 1028677821 is about 1009.4693225649.

The spelling of 1028677821 in words is "one billion, twenty-eight million, six hundred seventy-seven thousand, eight hundred twenty-one".