87947709 has 4 divisors (see below), whose sum is σ = 117263616. Its totient is φ = 58631804.

The previous prime is 87947677. The next prime is 87947729. The reversal of 87947709 is 90774978.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87947709 - 2⁵ = 87947677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87947729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14657949 + ... + 14657954.

It is an arithmetic number, because the mean of its divisors is an integer number (29315904).

Almost surely, 2^87947709 is an apocalyptic number.

It is an amenable number.

87947709 is a deficient number, since it is larger than the sum of its proper divisors (29315907).

87947709 is a wasteful number, since it uses less digits than its factorization.

87947709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29315906.

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 87947709 is about 9378.0439858214. The cubic root of 87947709 is about 444.7078990342.

The spelling of 87947709 in words is "eighty-seven million, nine hundred forty-seven thousand, seven hundred nine".