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688030137 = 32174496929
BaseRepresentation
bin101001000000101…
…000000110111001
31202221122112220200
4221000220012321
52402113431022
6152134512413
723023105524
oct5100500671
91687575820
10688030137
11323414253
12172505709
13ac70b032
146753dbbb
154060abac
hex290281b9

688030137 has 12 divisors (see below), whose sum is σ = 1052281620. Its totient is φ = 431705088.

The previous prime is 688030129. The next prime is 688030159. The reversal of 688030137 is 731030886.

It can be written as a sum of positive squares in 2 ways, for example, as 529874361 + 158155776 = 23019^2 + 12576^2 .

It is not a de Polignac number, because 688030137 - 23 = 688030129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688010137) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2248312 + ... + 2248617.

It is an arithmetic number, because the mean of its divisors is an integer number (87690135).

Almost surely, 2688030137 is an apocalyptic number.

It is an amenable number.

688030137 is a deficient number, since it is larger than the sum of its proper divisors (364251483).

688030137 is a wasteful number, since it uses less digits than its factorization.

688030137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496952 (or 4496949 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 688030137 is about 26230.3285720938. The cubic root of 688030137 is about 882.8138823068.

The spelling of 688030137 in words is "six hundred eighty-eight million, thirty thousand, one hundred thirty-seven".

Divisors: 1 3 9 17 51 153 4496929 13490787 40472361 76447793 229343379 688030137