78279812 has 12 divisors (see below), whose sum is σ = 147527436. Its totient is φ = 36129120.

The previous prime is 78279793. The next prime is 78279841. The reversal of 78279812 is 21897287.

It can be written as a sum of positive squares in 2 ways, for example, as 24462916 + 53816896 = 4946^2 + 7336^2 .

It is a super-2 number, since 2×78279812² = 12255457933510688, which contains 22 as substring.

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, 752639 + ... + 752742.

It is an arithmetic number, because the mean of its divisors is an integer number (12293953).

Almost surely, 2^78279812 is an apocalyptic number.

It is an amenable number.

78279812 is a deficient number, since it is larger than the sum of its proper divisors (69247624).

78279812 is a wasteful number, since it uses less digits than its factorization.

78279812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505398 (or 1505396 counting only the distinct ones).

The product of its digits is 112896, while the sum is 44.

The square root of 78279812 is about 8847.5879198796. The cubic root of 78279812 is about 427.7761734740.

The spelling of 78279812 in words is "seventy-eight million, two hundred seventy-nine thousand, eight hundred twelve".