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256561264 = 2459463587
BaseRepresentation
bin11110100101011…
…01000001110000
3122212202122220001
433102231001300
51011134430024
641242555344
76233510011
oct1722550160
9585678801
10256561264
11121905303
1271b08b54
13411cbccb
1426107008
15177cd244
hexf4ad070

256561264 has 40 divisors (see below), whose sum is σ = 507467520. Its totient is φ = 125619648.

The previous prime is 256561247. The next prime is 256561307. The reversal of 256561264 is 462165652.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 436779 + ... + 437365.

It is an arithmetic number, because the mean of its divisors is an integer number (12686688).

Almost surely, 2256561264 is an apocalyptic number.

It is an amenable number.

256561264 is a deficient number, since it is larger than the sum of its proper divisors (250906256).

256561264 is a wasteful number, since it uses less digits than its factorization.

256561264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117 (or 1111 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 256561264 is about 16017.5298969598. The cubic root of 256561264 is about 635.4241190882.

The spelling of 256561264 in words is "two hundred fifty-six million, five hundred sixty-one thousand, two hundred sixty-four".

Divisors: 1 2 4 8 16 59 118 236 463 472 587 926 944 1174 1852 2348 3704 4696 7408 9392 27317 34633 54634 69266 109268 138532 218536 271781 277064 437072 543562 554128 1087124 2174248 4348496 16035079 32070158 64140316 128280632 256561264