1028640460 has 12 divisors (see below), whose sum is σ = 2160145008. Its totient is φ = 411456176.

The previous prime is 1028640451. The next prime is 1028640461. The reversal of 1028640460 is 640468201.

It is not an unprimeable number, because it can be changed into a prime (1028640461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25715992 + ... + 25716031.

It is an arithmetic number, because the mean of its divisors is an integer number (180012084).

Almost surely, 2^1028640460 is an apocalyptic number.

1028640460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028640460 is an abundant number, since it is smaller than the sum of its proper divisors (1131504548).

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

1028640460 is a wasteful number, since it uses less digits than its factorization.

1028640460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51432032 (or 51432030 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 1028640460 is about 32072.4252279119. The cubic root of 1028640460 is about 1009.4571012975.

The spelling of 1028640460 in words is "one billion, twenty-eight million, six hundred forty thousand, four hundred sixty".