78827720 has 32 divisors (see below), whose sum is σ = 177622200. Its totient is φ = 31484928.

The previous prime is 78827719. The next prime is 78827731. The reversal of 78827720 is 2772887.

It can be written as a sum of positive squares in 4 ways, for example, as 39112516 + 39715204 = 6254^2 + 6302^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43472 + ... + 45248.

Almost surely, 2^78827720 is an apocalyptic number.

It is an amenable number.

78827720 is an abundant number, since it is smaller than the sum of its proper divisors (98794480).

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

78827720 is a wasteful number, since it uses less digits than its factorization.

78827720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897 (or 2893 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 78827720 is about 8878.4976206563. The cubic root of 78827720 is about 428.7719059943.

The spelling of 78827720 in words is "seventy-eight million, eight hundred twenty-seven thousand, seven hundred twenty".