78187612 has 12 divisors (see below), whose sum is σ = 137873736. Its totient is φ = 38795120.

The previous prime is 78187597. The next prime is 78187621. The reversal of 78187612 is 21678187.

It is a super-2 number, since 2×78187612² = 12226605340525088, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 74083 + ... + 75130.

It is an arithmetic number, because the mean of its divisors is an integer number (11489478).

Almost surely, 2^78187612 is an apocalyptic number.

It is an amenable number.

78187612 is a deficient number, since it is larger than the sum of its proper divisors (59686124).

78187612 is a wasteful number, since it uses less digits than its factorization.

78187612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149348 (or 149346 counting only the distinct ones).

The product of its digits is 37632, while the sum is 40.

The square root of 78187612 is about 8842.3759250554. The cubic root of 78187612 is about 427.6081588557.

The spelling of 78187612 in words is "seventy-eight million, one hundred eighty-seven thousand, six hundred twelve".