87780247 has 8 divisors (see below), whose sum is σ = 93354800. Its totient is φ = 82301184.

The previous prime is 87780223. The next prime is 87780263. The reversal of 87780247 is 74208778.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87780247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87780047) 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, 21972 + ... + 25657.

It is an arithmetic number, because the mean of its divisors is an integer number (11669350).

Almost surely, 2^87780247 is an apocalyptic number.

87780247 is a deficient number, since it is larger than the sum of its proper divisors (5574553).

87780247 is a wasteful number, since it uses less digits than its factorization.

87780247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47745.

The product of its (nonzero) digits is 175616, while the sum is 43.

The square root of 87780247 is about 9369.1113239197. Note that the first 3 decimals coincide. The cubic root of 87780247 is about 444.4254622981.

The spelling of 87780247 in words is "eighty-seven million, seven hundred eighty thousand, two hundred forty-seven".