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87917431 = 723546071
BaseRepresentation
bin1010011110110…
…00001101110111
320010102200001011
411033120031313
5140001324211
612420213051
72115200020
oct517301567
9203380034
1087917431
1145699738
122553a187
13152a3064
14b967c47
157ab9921
hex53d8377

87917431 has 8 divisors (see below), whose sum is σ = 104845824. Its totient is φ = 72081240.

The previous prime is 87917411. The next prime is 87917443. The reversal of 87917431 is 13471978.

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

It is not a de Polignac number, because 87917431 - 25 = 87917399 is a prime.

It is a super-2 number, since 2×879174312 = 15458949347279522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87917411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272875 + ... + 273196.

It is an arithmetic number, because the mean of its divisors is an integer number (13105728).

Almost surely, 287917431 is an apocalyptic number.

87917431 is a deficient number, since it is larger than the sum of its proper divisors (16928393).

87917431 is a wasteful number, since it uses less digits than its factorization.

87917431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546101.

The product of its digits is 42336, while the sum is 40.

The square root of 87917431 is about 9376.4295443415. The cubic root of 87917431 is about 444.6568595722.

The spelling of 87917431 in words is "eighty-seven million, nine hundred seventeen thousand, four hundred thirty-one".

Divisors: 1 7 23 161 546071 3822497 12559633 87917431