78780208787 has 64 divisors (see below), whose sum is σ = 98916249600. Its totient is φ = 62558496000.

The previous prime is 78780208783. The next prime is 78780208823.

78780208787 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78780208787 - 2² = 78780208783 is a prime.

It is a super-2 number, since 2×78780208787² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78780208783) 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 63 ways as a sum of consecutive naturals, for example, 48839993 + ... + 48841605.

It is an arithmetic number, because the mean of its divisors is an integer number (1545566400).

Almost surely, 2^78780208787 is an apocalyptic number.

78780208787 is a deficient number, since it is larger than the sum of its proper divisors (20136040813).

78780208787 is a wasteful number, since it uses less digits than its factorization.

78780208787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849 (or 1835 counting only the distinct ones).

The product of its (nonzero) digits is 19668992, while the sum is 62.

The spelling of 78780208787 in words is "seventy-eight billion, seven hundred eighty million, two hundred eight thousand, seven hundred eighty-seven".