1028408840 has 16 divisors (see below), whose sum is σ = 2313919980. Its totient is φ = 411363520.

The previous prime is 1028408837. The next prime is 1028408861. The reversal of 1028408840 is 488048201.

It can be written as a sum of positive squares in 2 ways, for example, as 998180836 + 30228004 = 31594^2 + 5498^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1028408840.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12855071 + ... + 12855150.

Almost surely, 2^1028408840 is an apocalyptic number.

1028408840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028408840 is an abundant number, since it is smaller than the sum of its proper divisors (1285511140).

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

1028408840 is a wasteful number, since it uses less digits than its factorization.

1028408840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25710232 (or 25710228 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 1028408840 is about 32068.8141346075. The cubic root of 1028408840 is about 1009.3813287887.

The spelling of 1028408840 in words is "one billion, twenty-eight million, four hundred eight thousand, eight hundred forty".