87775890 has 32 divisors (see below), whose sum is σ = 210914496. Its totient is φ = 23378880.

The previous prime is 87775861. The next prime is 87775901. The reversal of 87775890 is 9857778.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40125 + ... + 42255.

It is an arithmetic number, because the mean of its divisors is an integer number (6591078).

Almost surely, 2^87775890 is an apocalyptic number.

87775890 is an abundant number, since it is smaller than the sum of its proper divisors (123138606).

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

87775890 is a wasteful number, since it uses less digits than its factorization.

87775890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514.

The product of its (nonzero) digits is 987840, while the sum is 51.

The square root of 87775890 is about 9368.8788016496. The cubic root of 87775890 is about 444.4181091108.

It can be divided in two parts, 877 and 75890, that added together give a palindrome (76767).

The spelling of 87775890 in words is "eighty-seven million, seven hundred seventy-five thousand, eight hundred ninety".