78255500 has 24 divisors (see below), whose sum is σ = 170911104. Its totient is φ = 31302000.

The previous prime is 78255491. The next prime is 78255503. The reversal of 78255500 is 555287.

It is a happy number.

It is a super-2 number, since 2×78255500² = 12247846560500000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78255503) 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, 77756 + ... + 78755.

It is an arithmetic number, because the mean of its divisors is an integer number (7121296).

Almost surely, 2^78255500 is an apocalyptic number.

It is an amenable number.

78255500 is an abundant number, since it is smaller than the sum of its proper divisors (92655604).

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

78255500 is a wasteful number, since it uses less digits than its factorization.

78255500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156530 (or 156518 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 78255500 is about 8846.2138793950. The cubic root of 78255500 is about 427.7318829095.

The spelling of 78255500 in words is "seventy-eight million, two hundred fifty-five thousand, five hundred".