787788 has 36 divisors (see below), whose sum is σ = 2023840. Its totient is φ = 258336.

The previous prime is 787783. The next prime is 787793. The reversal of 787788 is 887787.

It is an interprime number because it is at equal distance from previous prime (787783) and next prime (787793).

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (787783) by changing a digit.

787788 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2706 + ... + 2982.

2⁷⁸⁷⁷⁸⁸ 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 787788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1011920).

787788 is an abundant number, since it is smaller than the sum of its proper divisors (1236052).

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

787788 is a wasteful number, since it uses less digits than its factorization.

787788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 361 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 787788 is about 887.5742222485. The cubic root of 787788 is about 92.3569935355.

Subtracting 787788 from its reverse (887787), we obtain a palindrome (99999).

The spelling of 787788 in words is "seven hundred eighty-seven thousand, seven hundred eighty-eight".