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643433956 = 2211211532
BaseRepresentation
bin100110010110100…
…000010111100100
31122211201211110021
4212112200113210
52304204341311
6143503004524
721642045514
oct4626402744
91584654407
10643433956
11300224500
1215b599744
13a33c5469
1461651844
153b74c171
hex265a05e4

643433956 has 27 divisors (see below), whose sum is σ = 1238754153. Its totient is φ = 292216320.

The previous prime is 643433941. The next prime is 643433977. The reversal of 643433956 is 659334346.

The square root of 643433956 is 25366.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 508502500 + 134931456 = 22550^2 + 11616^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 557476 + ... + 558628.

Almost surely, 2643433956 is an apocalyptic number.

643433956 is the 25366-th square number.

It is an amenable number.

643433956 is a deficient number, since it is larger than the sum of its proper divisors (595320197).

643433956 is a wasteful number, since it uses less digits than its factorization.

643433956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 1166 counting only the distinct ones).

The product of its digits is 699840, while the sum is 43.

The cubic root of 643433956 is about 863.3124262945.

The spelling of 643433956 in words is "six hundred forty-three million, four hundred thirty-three thousand, nine hundred fifty-six".