1028465280 has 384 divisors, whose sum is σ = 3780691200. Its totient is φ = 257187840.

The previous prime is 1028465261. The next prime is 1028465287. The reversal of 1028465280 is 825648201.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1028465287) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7850815 + ... + 7850945.

It is an arithmetic number, because the mean of its divisors is an integer number (9845550).

Almost surely, 2^1028465280 is an apocalyptic number.

1028465280 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 1028465280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1890345600).

1028465280 is an abundant number, since it is smaller than the sum of its proper divisors (2752225920).

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

1028465280 is a wasteful number, since it uses less digits than its factorization.

1028465280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 1028465280 is about 32069.6941051829. The cubic root of 1028465280 is about 1009.3997937019.

The spelling of 1028465280 in words is "one billion, twenty-eight million, four hundred sixty-five thousand, two hundred eighty".