78255780 has 48 divisors (see below), whose sum is σ = 226189824. Its totient is φ = 20194560.

The previous prime is 78255769. The next prime is 78255847. The reversal of 78255780 is 8755287.

It is a happy number.

It is a super-2 number, since 2×78255780² = 12247934206816800, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 19177 + ... + 22896.

It is an arithmetic number, because the mean of its divisors is an integer number (4712288).

Almost surely, 2^78255780 is an apocalyptic number.

It is an amenable number.

78255780 is an abundant number, since it is smaller than the sum of its proper divisors (147934044).

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

78255780 is a wasteful number, since it uses less digits than its factorization.

78255780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42116 (or 42114 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 78255780 is about 8846.2297053604. The cubic root of 78255780 is about 427.7323930537.

The spelling of 78255780 in words is "seventy-eight million, two hundred fifty-five thousand, seven hundred eighty".