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288390857 = 2339471307
BaseRepresentation
bin10001001100000…
…111111011001001
3202002122202212212
4101030013323021
51042312001412
644341114505
710101165446
oct2114077311
9662582785
10288390857
11138875357
12806b8a35
13479949a1
142a4309cd
151a4b9222
hex11307ec9

288390857 has 8 divisors (see below), whose sum is σ = 290156256. Its totient is φ = 286630432.

The previous prime is 288390821. The next prime is 288390863. The reversal of 288390857 is 758093882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 288390857 - 26 = 288390793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (288390257) 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, 219998 + ... + 221304.

It is an arithmetic number, because the mean of its divisors is an integer number (36269532).

Almost surely, 2288390857 is an apocalyptic number.

It is an amenable number.

288390857 is a deficient number, since it is larger than the sum of its proper divisors (1765399).

288390857 is a wasteful number, since it uses less digits than its factorization.

288390857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487.

The product of its (nonzero) digits is 967680, while the sum is 50.

The square root of 288390857 is about 16982.0745788022. The cubic root of 288390857 is about 660.6840604234.

The spelling of 288390857 in words is "two hundred eighty-eight million, three hundred ninety thousand, eight hundred fifty-seven".

Divisors: 1 233 947 1307 220651 304531 1237729 288390857