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688147089 = 37313104693
BaseRepresentation
bin101001000001000…
…100101010010001
31202221212111100020
4221001010222101
52402131201324
6152141214053
723024103510
oct5101045221
91687774306
10688147089
11323494103
12172561329
13ac74c336
1467570677
1540630679
hex29044a91

688147089 has 16 divisors (see below), whose sum is σ = 1051965312. Its totient is φ = 391966848.

The previous prime is 688146989. The next prime is 688147121. The reversal of 688147089 is 980741886.

It is not a de Polignac number, because 688147089 - 220 = 687098513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688147289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45774 + ... + 58919.

It is an arithmetic number, because the mean of its divisors is an integer number (65747832).

Almost surely, 2688147089 is an apocalyptic number.

It is an amenable number.

688147089 is a deficient number, since it is larger than the sum of its proper divisors (363818223).

688147089 is a wasteful number, since it uses less digits than its factorization.

688147089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105016.

The product of its (nonzero) digits is 774144, while the sum is 51.

The square root of 688147089 is about 26232.5578051398. The cubic root of 688147089 is about 882.8638999800.

The spelling of 688147089 in words is "six hundred eighty-eight million, one hundred forty-seven thousand, eighty-nine".

Divisors: 1 3 7 21 313 939 2191 6573 104693 314079 732851 2198553 32768909 98306727 229382363 688147089