87758891 has 16 divisors (see below), whose sum is σ = 101088000. Its totient is φ = 75348000.

The previous prime is 87758813. The next prime is 87758899. The reversal of 87758891 is 19885778.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 87758891 - 2¹⁰ = 87757867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87758899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124841 + ... + 125541.

It is an arithmetic number, because the mean of its divisors is an integer number (6318000).

Almost surely, 2^87758891 is an apocalyptic number.

87758891 is a deficient number, since it is larger than the sum of its proper divisors (13329109).

87758891 is a wasteful number, since it uses less digits than its factorization.

87758891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its digits is 1128960, while the sum is 53.

The square root of 87758891 is about 9367.9715520490. The cubic root of 87758891 is about 444.3894180463.

The spelling of 87758891 in words is "eighty-seven million, seven hundred fifty-eight thousand, eight hundred ninety-one".