87784891 has 4 divisors (see below), whose sum is σ = 87819984. Its totient is φ = 87749800.

The previous prime is 87784877. The next prime is 87784933. The reversal of 87784891 is 19848778.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87784891 is a prime.

It is a super-3 number, since 3×87784891³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87787891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13480 + ... + 18901.

It is an arithmetic number, because the mean of its divisors is an integer number (21954996).

Almost surely, 2^87784891 is an apocalyptic number.

87784891 is a deficient number, since it is larger than the sum of its proper divisors (35093).

87784891 is a wasteful number, since it uses less digits than its factorization.

87784891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35092.

The product of its digits is 903168, while the sum is 52.

The square root of 87784891 is about 9369.3591563137. The cubic root of 87784891 is about 444.4332995793.

The spelling of 87784891 in words is "eighty-seven million, seven hundred eighty-four thousand, eight hundred ninety-one".