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28160021900 = 2252281600219
BaseRepresentation
bin11010001110011101…
…111101010110001100
32200200112001022221002
4122032131331112030
5430132431200100
620534142555432
72014555144133
oct321635752614
980615038832
1028160021900
1110a4066427a
12555a898b78
13286a11846a
141511d2691a
15aec3252d5
hex68e77d58c

28160021900 has 18 divisors (see below), whose sum is σ = 61107247740. Its totient is φ = 11264008720.

The previous prime is 28160021899. The next prime is 28160021983. The reversal of 28160021900 is 912006182.

It is a super-2 number, since 2×281600219002 (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 140800010 + ... + 140800209.

Almost surely, 228160021900 is an apocalyptic number.

28160021900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28160021900 is an abundant number, since it is smaller than the sum of its proper divisors (32947225840).

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

28160021900 is a wasteful number, since it uses less digits than its factorization.

28160021900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281600233 (or 281600226 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 28160021900 in words is "twenty-eight billion, one hundred sixty million, twenty-one thousand, nine hundred".

Divisors: 1 2 4 5 10 20 25 50 100 281600219 563200438 1126400876 1408001095 2816002190 5632004380 7040005475 14080010950 28160021900