87755778 has 64 divisors (see below), whose sum is σ = 214323840. Its totient is φ = 26395200.

The previous prime is 87755743. The next prime is 87755821.

87755778 is a `hidden beast` number, since 87 + 7 + 557 + 7 + 8 = 666.

87755778 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (3841600) is a multiple of the sum of its prime factors (1120).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92788 + ... + 93728.

It is an arithmetic number, because the mean of its divisors is an integer number (3348810).

Almost surely, 2^87755778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87755778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107161920).

87755778 is an abundant number, since it is smaller than the sum of its proper divisors (126568062).

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

87755778 is a wasteful number, since it uses less digits than its factorization.

87755778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120 (or 1114 counting only the distinct ones).

The product of its digits is 3841600, while the sum is 54.

The square root of 87755778 is about 9367.8053993451. The cubic root of 87755778 is about 444.3841634956.

The spelling of 87755778 in words is "eighty-seven million, seven hundred fifty-five thousand, seven hundred seventy-eight".