78445240 has 16 divisors (see below), whose sum is σ = 176501880. Its totient is φ = 31378080.

The previous prime is 78445189. The next prime is 78445253. The reversal of 78445240 is 4254487.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 78445196 and 78445205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980526 + ... + 980605.

Almost surely, 2^78445240 is an apocalyptic number.

It is an amenable number.

78445240 is an abundant number, since it is smaller than the sum of its proper divisors (98056640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78445240 is a wasteful number, since it uses less digits than its factorization.

78445240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961142 (or 1961138 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 78445240 is about 8856.9317486362. The cubic root of 78445240 is about 428.0772999230.

The spelling of 78445240 in words is "seventy-eight million, four hundred forty-five thousand, two hundred forty".