78240784 has 20 divisors (see below), whose sum is σ = 159570640. Its totient is φ = 37061280.

The previous prime is 78240769. The next prime is 78240821. The reversal of 78240784 is 48704287.

It is a happy number.

It is a super-2 number, since 2×78240784² = 12243240561869312, 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, 128382 + ... + 128989.

It is an arithmetic number, because the mean of its divisors is an integer number (7978532).

Almost surely, 2^78240784 is an apocalyptic number.

It is an amenable number.

78240784 is an abundant number, since it is smaller than the sum of its proper divisors (81329856).

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

78240784 is a wasteful number, since it uses less digits than its factorization.

78240784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257398 (or 257392 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 40.

The square root of 78240784 is about 8845.3820720193. The cubic root of 78240784 is about 427.7050694715.

The spelling of 78240784 in words is "seventy-eight million, two hundred forty thousand, seven hundred eighty-four".