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87000145 = 51923291373
BaseRepresentation
bin1010010111110…
…00010001010001
320001201001202121
411023320101101
5134233001040
612344414241
72104326511
oct513702121
9201631677
1087000145
1145122551
1225177381
131504169b
14b7a9841
157987c4a
hex52f8451

87000145 has 32 divisors (see below), whose sum is σ = 118713600. Its totient is φ = 60850944.

The previous prime is 87000139. The next prime is 87000157. The reversal of 87000145 is 54100078.

It is a 4-Lehmer number, since φ(87000145) divides (87000145-1)4.

It is a cyclic number.

It is not a de Polignac number, because 87000145 - 225 = 53445713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62679 + ... + 64051.

It is an arithmetic number, because the mean of its divisors is an integer number (3709800).

Almost surely, 287000145 is an apocalyptic number.

It is an amenable number.

87000145 is a deficient number, since it is larger than the sum of its proper divisors (31713455).

87000145 is a wasteful number, since it uses less digits than its factorization.

87000145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 87000145 is about 9327.3868259015. The cubic root of 87000145 is about 443.1050083385.

The spelling of 87000145 in words is "eighty-seven million, one hundred forty-five", and thus it is an aban number.

Divisors: 1 5 19 23 29 95 115 145 437 551 667 1373 2185 2755 3335 6865 12673 26087 31579 39817 63365 130435 157895 199085 600001 756523 915791 3000005 3782615 4578955 17400029 87000145