87117770 has 8 divisors (see below), whose sum is σ = 156812004. Its totient is φ = 34847104.

The previous prime is 87117763. The next prime is 87117773. The reversal of 87117770 is 7771178.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 85914361 + 1203409 = 9269^2 + 1097^2 .

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

It is not an unprimeable number, because it can be changed into a prime (87117773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4355879 + ... + 4355898.

Almost surely, 2^87117770 is an apocalyptic number.

87117770 is a deficient number, since it is larger than the sum of its proper divisors (69694234).

87117770 is a wasteful number, since it uses less digits than its factorization.

87117770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8711784.

The product of its (nonzero) digits is 19208, while the sum is 38.

The square root of 87117770 is about 9333.6900527069. The cubic root of 87117770 is about 443.3046124320.

The spelling of 87117770 in words is "eighty-seven million, one hundred seventeen thousand, seven hundred seventy".