78612224 has 18 divisors (see below), whose sum is σ = 156917880. Its totient is φ = 39305984.

The previous prime is 78612223. The next prime is 78612227. The reversal of 78612224 is 42221687.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78612221) 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 as a sum of consecutive naturals, namely, 153284 + ... + 153795.

It is an arithmetic number, because the mean of its divisors is an integer number (8717660).

Almost surely, 2^78612224 is an apocalyptic number.

It is an amenable number.

78612224 is a deficient number, since it is larger than the sum of its proper divisors (78305656).

78612224 is an equidigital number, since it uses as much as digits as its factorization.

78612224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307095 (or 307081 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 78612224 is about 8866.3534781780. The cubic root of 78612224 is about 428.3808297024.

The spelling of 78612224 in words is "seventy-eight million, six hundred twelve thousand, two hundred twenty-four".