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99869978 = 2133841153
BaseRepresentation
bin1011111001111…
…10010100011010
320221220220212002
411330332110122
5201031314403
613524321002
72321611055
oct574762432
9227826762
1099869978
115141287a
1229543162
13178c9580
14d399a9c
158b7b188
hex5f3e51a

99869978 has 8 divisors (see below), whose sum is σ = 161328468. Its totient is φ = 46093824.

The previous prime is 99869977. The next prime is 99869981. The reversal of 99869978 is 87996899.

It can be written as a sum of positive squares in 2 ways, for example, as 77563249 + 22306729 = 8807^2 + 4723^2 .

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

It is not an unprimeable number, because it can be changed into a prime (99869977) 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, 1920551 + ... + 1920602.

Almost surely, 299869978 is an apocalyptic number.

99869978 is a deficient number, since it is larger than the sum of its proper divisors (61458490).

99869978 is a wasteful number, since it uses less digits than its factorization.

99869978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841168.

The product of its digits is 17635968, while the sum is 65.

The square root of 99869978 is about 9993.4967854100. The cubic root of 99869978 is about 463.9576265556.

The spelling of 99869978 in words is "ninety-nine million, eight hundred sixty-nine thousand, nine hundred seventy-eight".

Divisors: 1 2 13 26 3841153 7682306 49934989 99869978