87136890 has 32 divisors (see below), whose sum is σ = 214232256. Its totient is φ = 22669440.

The previous prime is 87136879. The next prime is 87136891. The reversal of 87136890 is 9863178.

It is not an unprimeable number, because it can be changed into a prime (87136891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34192 + ... + 36651.

It is an arithmetic number, because the mean of its divisors is an integer number (6694758).

Almost surely, 2^87136890 is an apocalyptic number.

87136890 is an abundant number, since it is smaller than the sum of its proper divisors (127095366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87136890 is a wasteful number, since it uses less digits than its factorization.

87136890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70894.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 87136890 is about 9334.7142430821. The cubic root of 87136890 is about 443.3370411936.

The spelling of 87136890 in words is "eighty-seven million, one hundred thirty-six thousand, eight hundred ninety".