78440324 has 12 divisors (see below), whose sum is σ = 138530700. Its totient is φ = 38860128.

The previous prime is 78440291. The next prime is 78440357. The reversal of 78440324 is 42304487.

It is an interprime number because it is at equal distance from previous prime (78440291) and next prime (78440357).

It can be written as a sum of positive squares in 2 ways, for example, as 43983424 + 34456900 = 6632^2 + 5870^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 89519 + ... + 90390.

It is an arithmetic number, because the mean of its divisors is an integer number (11544225).

Almost surely, 2^78440324 is an apocalyptic number.

It is an amenable number.

78440324 is a deficient number, since it is larger than the sum of its proper divisors (60090376).

78440324 is a wasteful number, since it uses less digits than its factorization.

78440324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180022 (or 180020 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 78440324 is about 8856.6542215444. The cubic root of 78440324 is about 428.0683574982.

The spelling of 78440324 in words is "seventy-eight million, four hundred forty thousand, three hundred twenty-four".