87787856 has 20 divisors (see below), whose sum is σ = 183173172. Its totient is φ = 40517376.

The previous prime is 87787841. The next prime is 87787867. The reversal of 87787856 is 65878778.

It can be written as a sum of positive squares in 2 ways, for example, as 7075600 + 80712256 = 2660^2 + 8984^2 .

It is a super-2 number, since 2×87787856² = 15413415322153472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210821 + ... + 211236.

Almost surely, 2^87787856 is an apocalyptic number.

It is an amenable number.

87787856 is an abundant number, since it is smaller than the sum of its proper divisors (95385316).

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

87787856 is a wasteful number, since it uses less digits than its factorization.

87787856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422078 (or 422072 counting only the distinct ones).

The product of its digits is 5268480, while the sum is 56.

The square root of 87787856 is about 9369.5173835155. The cubic root of 87787856 is about 444.4383032114.

The spelling of 87787856 in words is "eighty-seven million, seven hundred eighty-seven thousand, eight hundred fifty-six".