1028978679 has 4 divisors (see below), whose sum is σ = 1371971576. Its totient is φ = 685985784.

The previous prime is 1028978663. The next prime is 1028978701. The reversal of 1028978679 is 9768798201.

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

It is not a de Polignac number, because 1028978679 - 2⁴ = 1028978663 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 (1028978479) 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, 171496444 + ... + 171496449.

It is an arithmetic number, because the mean of its divisors is an integer number (342992894).

Almost surely, 2^1028978679 is an apocalyptic number.

1028978679 is a deficient number, since it is larger than the sum of its proper divisors (342992897).

1028978679 is an equidigital number, since it uses as much as digits as its factorization.

1028978679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342992896.

The product of its (nonzero) digits is 3048192, while the sum is 57.

The square root of 1028978679 is about 32077.6975327095. The cubic root of 1028978679 is about 1009.5677263319.

The spelling of 1028978679 in words is "one billion, twenty-eight million, nine hundred seventy-eight thousand, six hundred seventy-nine".