1028979720 has 128 divisors (see below), whose sum is σ = 3486384000. Its totient is φ = 269879040.

The previous prime is 1028979719. The next prime is 1028979761. The reversal of 1028979720 is 279798201.

1028979720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58071 + ... + 73689.

It is an arithmetic number, because the mean of its divisors is an integer number (27237375).

Almost surely, 2^1028979720 is an apocalyptic number.

1028979720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1028979720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1743192000).

1028979720 is an abundant number, since it is smaller than the sum of its proper divisors (2457404280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1028979720 is a wasteful number, since it uses less digits than its factorization.

1028979720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15700 (or 15690 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 1028979720 is about 32077.7137589324. The cubic root of 1028979720 is about 1009.5680667858.

It can be divided in two parts, 10289 and 79720, that added together give a palindrome (90009).

The spelling of 1028979720 in words is "one billion, twenty-eight million, nine hundred seventy-nine thousand, seven hundred twenty".