78223154 has 16 divisors (see below), whose sum is σ = 124581888. Its totient is φ = 36708672.

The previous prime is 78223151. The next prime is 78223219. The reversal of 78223154 is 45132287.

It is a super-2 number, since 2×78223154² = 12237723643415432, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78223154.

It is not an unprimeable number, because it can be changed into a prime (78223151) 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, 10019 + ... + 16025.

It is an arithmetic number, because the mean of its divisors is an integer number (7786368).

Almost surely, 2^78223154 is an apocalyptic number.

78223154 is a deficient number, since it is larger than the sum of its proper divisors (46358734).

78223154 is a wasteful number, since it uses less digits than its factorization.

78223154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6409.

The product of its digits is 13440, while the sum is 32.

The square root of 78223154 is about 8844.3854506687. The cubic root of 78223154 is about 427.6729421229.

The spelling of 78223154 in words is "seventy-eight million, two hundred twenty-three thousand, one hundred fifty-four".