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28431664 = 244194241
BaseRepresentation
bin110110001110…
…1010100110000
31222111110220121
41230131110300
524234303124
62453220024
7463444102
oct154352460
958443817
1028431664
111505a148
129631614
135b76191
143ac1572
1527692e4
hex1b1d530

28431664 has 20 divisors (see below), whose sum is σ = 55230840. Its totient is φ = 14178560.

The previous prime is 28431659. The next prime is 28431671. The reversal of 28431664 is 46613482.

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, 4584 + ... + 8824.

It is an arithmetic number, because the mean of its divisors is an integer number (2761542).

Almost surely, 228431664 is an apocalyptic number.

It is an amenable number.

28431664 is a deficient number, since it is larger than the sum of its proper divisors (26799176).

28431664 is a wasteful number, since it uses less digits than its factorization.

28431664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4668 (or 4662 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 28431664 is about 5332.1350320486. The cubic root of 28431664 is about 305.2114058836.

The spelling of 28431664 in words is "twenty-eight million, four hundred thirty-one thousand, six hundred sixty-four".

Divisors: 1 2 4 8 16 419 838 1676 3352 4241 6704 8482 16964 33928 67856 1776979 3553958 7107916 14215832 28431664