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87898989 = 3175916657
BaseRepresentation
bin1010011110100…
…11101101101101
320010101201202010
411033103231231
5140000231424
612415551433
72115062163
oct517235555
9203351663
1087898989
11456868a2
122552b579
1315297849
14b961233
157ab4229
hex53d3b6d

87898989 has 8 divisors (see below), whose sum is σ = 117272320. Its totient is φ = 58562496.

The previous prime is 87898949. The next prime is 87898991. The reversal of 87898989 is 98989878.

87898989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is a de Polignac number, because none of the positive numbers 2k-87898989 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87898949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3052 + ... + 13605.

It is an arithmetic number, because the mean of its divisors is an integer number (14659040).

Almost surely, 287898989 is an apocalyptic number.

It is an amenable number.

87898989 is a deficient number, since it is larger than the sum of its proper divisors (29373331).

87898989 is a wasteful number, since it uses less digits than its factorization.

87898989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18419.

The product of its digits is 20901888, while the sum is 66.

The square root of 87898989 is about 9375.4460693878. The cubic root of 87898989 is about 444.6257662491.

The spelling of 87898989 in words is "eighty-seven million, eight hundred ninety-eight thousand, nine hundred eighty-nine".

Divisors: 1 3 1759 5277 16657 49971 29299663 87898989