1028643564 has 48 divisors (see below), whose sum is σ = 2590963200. Its totient is φ = 315750720.

The previous prime is 1028643541. The next prime is 1028643569. The reversal of 1028643564 is 4653468201.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1028643569) 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, 59587 + ... + 74885.

It is an arithmetic number, because the mean of its divisors is an integer number (53978400).

Almost surely, 2^1028643564 is an apocalyptic number.

It is an amenable number.

1028643564 is an abundant number, since it is smaller than the sum of its proper divisors (1562319636).

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

1028643564 is a wasteful number, since it uses less digits than its factorization.

1028643564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15750 (or 15748 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 1028643564 is about 32072.4736183538. The cubic root of 1028643564 is about 1009.4581166674.

The spelling of 1028643564 in words is "one billion, twenty-eight million, six hundred forty-three thousand, five hundred sixty-four".