87117890 has 16 divisors (see below), whose sum is σ = 157472640. Its totient is φ = 34700400.

The previous prime is 87117857. The next prime is 87117893. The reversal of 87117890 is 9871178.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87117893) 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, 15836 + ... + 20615.

It is an arithmetic number, because the mean of its divisors is an integer number (9842040).

Almost surely, 2^87117890 is an apocalyptic number.

87117890 is a deficient number, since it is larger than the sum of its proper divisors (70354750).

87117890 is a wasteful number, since it uses less digits than its factorization.

87117890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36697.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 87117890 is about 9333.6964810304. The cubic root of 87117890 is about 443.3048159746.

The spelling of 87117890 in words is "eighty-seven million, one hundred seventeen thousand, eight hundred ninety".