78097220 has 24 divisors (see below), whose sum is σ = 172636800. Its totient is φ = 29594592.

The previous prime is 78097211. The next prime is 78097223. The reversal of 78097220 is 2279087.

It is not an unprimeable number, because it can be changed into a prime (78097223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102380 + ... + 103139.

It is an arithmetic number, because the mean of its divisors is an integer number (7193200).

Almost surely, 2^78097220 is an apocalyptic number.

It is an amenable number.

78097220 is an abundant number, since it is smaller than the sum of its proper divisors (94539580).

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

78097220 is a wasteful number, since it uses less digits than its factorization.

78097220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205547 (or 205545 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 78097220 is about 8837.2631509987. The cubic root of 78097220 is about 427.4433106549.

The spelling of 78097220 in words is "seventy-eight million, ninety-seven thousand, two hundred twenty".