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72123862172 = 22211257332509
BaseRepresentation
bin100001100101011101…
…0101100110010011100
320220011102202211001112
41003022322230302130
52140202202042142
653044440401152
75132203466435
oct1031272546234
9226142684045
1072123862172
112865104916a
1211b8a1761b8
136a5546b82b
1436c2b1448c
151d21cdd382
hex10caeacc9c

72123862172 has 24 divisors (see below), whose sum is σ = 127308768720. Its totient is φ = 35751260160.

The previous prime is 72123862133. The next prime is 72123862177. The reversal of 72123862172 is 27126832127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72123862177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50654 + ... + 383162.

It is an arithmetic number, because the mean of its divisors is an integer number (5304532030).

Almost surely, 272123862172 is an apocalyptic number.

It is an amenable number.

72123862172 is a deficient number, since it is larger than the sum of its proper divisors (55184906548).

72123862172 is a wasteful number, since it uses less digits than its factorization.

72123862172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332981 (or 332979 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The spelling of 72123862172 in words is "seventy-two billion, one hundred twenty-three million, eight hundred sixty-two thousand, one hundred seventy-two".

Divisors: 1 2 4 211 257 422 514 844 1028 54227 108454 216908 332509 665018 1330036 70159399 85454813 140318798 170909626 280637596 341819252 18030965543 36061931086 72123862172