1864287728 has 20 divisors (see below), whose sum is σ = 3824532000. Its totient is φ = 877311744.

The previous prime is 1864287697. The next prime is 1864287739. The reversal of 1864287728 is 8277824681.

It is a self number, because there is not a number n which added to its sum of digits gives 1864287728.

It is a congruent number.

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, 3426728 + ... + 3427271.

It is an arithmetic number, because the mean of its divisors is an integer number (191226600).

Almost surely, 2^1864287728 is an apocalyptic number.

It is an amenable number.

1864287728 is an abundant number, since it is smaller than the sum of its proper divisors (1960244272).

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

1864287728 is a wasteful number, since it uses less digits than its factorization.

1864287728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6854024 (or 6854018 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 53.

The square root of 1864287728 is about 43177.3983468203. The cubic root of 1864287728 is about 1230.7532187837.

The spelling of 1864287728 in words is "one billion, eight hundred sixty-four million, two hundred eighty-seven thousand, seven hundred twenty-eight".