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1897136688 = 24339523681
BaseRepresentation
bin111000100010100…
…0000001000110000
311220012210112021210
41301011000020300
512341131333223
6512130120120
765004252516
oct16105001060
94805715253
101897136688
1189397a967
1244b420040
132430704b5
1413dd604b6
15b1844893
hex71140230

1897136688 has 20 divisors (see below), whose sum is σ = 4900936568. Its totient is φ = 632378880.

The previous prime is 1897136687. The next prime is 1897136693. The reversal of 1897136688 is 8866317981.

It is a super-2 number, since 2×18971366882 = 7198255225911218688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1897136687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19761793 + ... + 19761888.

Almost surely, 21897136688 is an apocalyptic number.

It is an amenable number.

1897136688 is an abundant number, since it is smaller than the sum of its proper divisors (3003799880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1897136688 is a wasteful number, since it uses less digits than its factorization.

1897136688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39523692 (or 39523686 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 57.

The square root of 1897136688 is about 43556.1326106899. The cubic root of 1897136688 is about 1237.9398430772.

The spelling of 1897136688 in words is "one billion, eight hundred ninety-seven million, one hundred thirty-six thousand, six hundred eighty-eight".

Divisors: 1 2 3 4 6 8 12 16 24 48 39523681 79047362 118571043 158094724 237142086 316189448 474284172 632378896 948568344 1897136688