87775776 has 144 divisors (see below), whose sum is σ = 275970240. Its totient is φ = 26242560.

The previous prime is 87775747. The next prime is 87775781. The reversal of 87775776 is 67757778.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 326170 + ... + 326438.

It is an arithmetic number, because the mean of its divisors is an integer number (1916460).

Almost surely, 2^87775776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87775776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137985120).

87775776 is an abundant number, since it is smaller than the sum of its proper divisors (188194464).

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

87775776 is a wasteful number, since it uses less digits than its factorization.

87775776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 388 counting only the distinct ones).

The product of its digits is 4033680, while the sum is 54.

The square root of 87775776 is about 9368.8727176753. The cubic root of 87775776 is about 444.4179167130.

The spelling of 87775776 in words is "eighty-seven million, seven hundred seventy-five thousand, seven hundred seventy-six".