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81643652 = 22232693299
BaseRepresentation
bin1001101110111…
…00100010000100
312200121221000222
410313130202010
5131400044102
612033523512
72010650066
oct467344204
9180557028
1081643652
11420a40a2
1223413598
1313bb756c
14abb3736
15727aaa2
hex4ddc884

81643652 has 24 divisors (see below), whose sum is σ = 149688000. Its totient is φ = 38890016.

The previous prime is 81643651. The next prime is 81643657. The reversal of 81643652 is 25634618.

It is not an unprimeable number, because it can be changed into a prime (81643651) 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, 23099 + ... + 26397.

It is an arithmetic number, because the mean of its divisors is an integer number (6237000).

Almost surely, 281643652 is an apocalyptic number.

It is an amenable number.

81643652 is a deficient number, since it is larger than the sum of its proper divisors (68044348).

81643652 is a wasteful number, since it uses less digits than its factorization.

81643652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3595 (or 3593 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 81643652 is about 9035.6876882725. The cubic root of 81643652 is about 433.8179065782.

The spelling of 81643652 in words is "eighty-one million, six hundred forty-three thousand, six hundred fifty-two".

Divisors: 1 2 4 23 46 92 269 538 1076 3299 6187 6598 12374 13196 24748 75877 151754 303508 887431 1774862 3549724 20410913 40821826 81643652