78750820 has 24 divisors (see below), whose sum is σ = 174081600. Its totient is φ = 29842272.

The previous prime is 78750809. The next prime is 78750829. The reversal of 78750820 is 2805787.

It is a self number, because there is not a number n which added to its sum of digits gives 78750820.

It is not an unprimeable number, because it can be changed into a prime (78750829) by changing a digit.

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, 103240 + ... + 103999.

It is an arithmetic number, because the mean of its divisors is an integer number (7253400).

Almost surely, 2^78750820 is an apocalyptic number.

It is an amenable number.

78750820 is an abundant number, since it is smaller than the sum of its proper divisors (95330780).

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

78750820 is a wasteful number, since it uses less digits than its factorization.

78750820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207267 (or 207265 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 78750820 is about 8874.1658762951. The cubic root of 78750820 is about 428.6324318454.

The spelling of 78750820 in words is "seventy-eight million, seven hundred fifty thousand, eight hundred twenty".