87780008778 has 96 divisors (see below), whose sum is σ = 232145733120. Its totient is φ = 21599978400.

The previous prime is 87780008777. The next prime is 87780008801.

87780008778 is nontrivially palindromic in base 10.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87780008777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 357988 + ... + 551103.

It is an arithmetic number, because the mean of its divisors is an integer number (2418184720).

Almost surely, 2^87780008778 is an apocalyptic number.

87780008778 is an abundant number, since it is smaller than the sum of its proper divisors (144365724342).

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

87780008778 is a wasteful number, since it uses less digits than its factorization.

87780008778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909144 (or 909133 counting only the distinct ones).

The product of its (nonzero) digits is 9834496, while the sum is 60.

The spelling of 87780008778 in words is "eighty-seven billion, seven hundred eighty million, eight thousand, seven hundred seventy-eight".