87947913 has 8 divisors (see below), whose sum is σ = 118915776. Its totient is φ = 57806000.

The previous prime is 87947887. The next prime is 87947921. The reversal of 87947913 is 31974978.

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 87947913 - 2¹⁰ = 87946889 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87947963) 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, 206238 + ... + 206663.

It is an arithmetic number, because the mean of its divisors is an integer number (14864472).

Almost surely, 2^87947913 is an apocalyptic number.

It is an amenable number.

87947913 is a deficient number, since it is larger than the sum of its proper divisors (30967863).

87947913 is a wasteful number, since it uses less digits than its factorization.

87947913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412975.

The product of its digits is 381024, while the sum is 48.

The square root of 87947913 is about 9378.0548622835. The cubic root of 87947913 is about 444.7082428762.

The spelling of 87947913 in words is "eighty-seven million, nine hundred forty-seven thousand, nine hundred thirteen".