1028264640 has 112 divisors (see below), whose sum is σ = 3515916768. Its totient is φ = 253108224.

The previous prime is 1028264639. The next prime is 1028264647. The reversal of 1028264640 is 464628201.

It is not an unprimeable number, because it can be changed into a prime (1028264647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28717 + ... + 53676.

It is an arithmetic number, because the mean of its divisors is an integer number (31392114).

Almost surely, 2^1028264640 is an apocalyptic number.

1028264640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028264640 is an abundant number, since it is smaller than the sum of its proper divisors (2487652128).

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

1028264640 is a wasteful number, since it uses less digits than its factorization.

1028264640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82426 (or 82416 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 1028264640 is about 32066.5657656070. The cubic root of 1028264640 is about 1009.3341492412.

The spelling of 1028264640 in words is "one billion, twenty-eight million, two hundred sixty-four thousand, six hundred forty".