78827780 has 24 divisors (see below), whose sum is σ = 167637120. Its totient is φ = 31131360.

The previous prime is 78827779. The next prime is 78827803. The reversal of 78827780 is 8772887.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23366 + ... + 26525.

It is an arithmetic number, because the mean of its divisors is an integer number (6984880).

Almost surely, 2^78827780 is an apocalyptic number.

It is an amenable number.

78827780 is an abundant number, since it is smaller than the sum of its proper divisors (88809340).

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

78827780 is a wasteful number, since it uses less digits than its factorization.

78827780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49979 (or 49977 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 47.

The square root of 78827780 is about 8878.5009996057. The cubic root of 78827780 is about 428.7720147813.

The spelling of 78827780 in words is "seventy-eight million, eight hundred twenty-seven thousand, seven hundred eighty".