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72161452 = 22111640033
BaseRepresentation
bin1000100110100…
…01100010101100
312000210011220101
410103101202230
5121433131302
611054400444
71534235146
oct423214254
9160704811
1072161452
1137807a70
1220200124
1311c475ac
149825c96
156506287
hex44d18ac

72161452 has 12 divisors (see below), whose sum is σ = 137762856. Its totient is φ = 32800640.

The previous prime is 72161431. The next prime is 72161477. The reversal of 72161452 is 25416127.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 72161452.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819973 + ... + 820060.

It is an arithmetic number, because the mean of its divisors is an integer number (11480238).

Almost surely, 272161452 is an apocalyptic number.

It is an amenable number.

72161452 is a deficient number, since it is larger than the sum of its proper divisors (65601404).

72161452 is a wasteful number, since it uses less digits than its factorization.

72161452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640048 (or 1640046 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 72161452 is about 8494.7896972203. The cubic root of 72161452 is about 416.3274895941.

Adding to 72161452 its reverse (25416127), we get a palindrome (97577579).

It can be divided in two parts, 7216 and 1452, that added together give a palindrome (8668).

The spelling of 72161452 in words is "seventy-two million, one hundred sixty-one thousand, four hundred fifty-two".

Divisors: 1 2 4 11 22 44 1640033 3280066 6560132 18040363 36080726 72161452