87840247 has 8 divisors (see below), whose sum is σ = 95896080. Its totient is φ = 79796160.

The previous prime is 87840209. The next prime is 87840251. The reversal of 87840247 is 74204878.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 87840247 - 2¹⁵ = 87807479 is a prime.

It is a super-3 number, since 3×87840247³ (a number of 25 digits) contains 333 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 (87840647) 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, 21829 + ... + 25537.

It is an arithmetic number, because the mean of its divisors is an integer number (11987010).

Almost surely, 2^87840247 is an apocalyptic number.

87840247 is a deficient number, since it is larger than the sum of its proper divisors (8055833).

87840247 is a wasteful number, since it uses less digits than its factorization.

87840247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5873.

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 87840247 is about 9372.3127882076. The cubic root of 87840247 is about 444.5266978852.

The spelling of 87840247 in words is "eighty-seven million, eight hundred forty thousand, two hundred forty-seven".