78509242 has 16 divisors (see below), whose sum is σ = 135090432. Its totient is φ = 33521040.

The previous prime is 78509209. The next prime is 78509243. The reversal of 78509242 is 24290587.

It is not an unprimeable number, because it can be changed into a prime (78509243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6553 + ... + 14140.

It is an arithmetic number, because the mean of its divisors is an integer number (8443152).

Almost surely, 2^78509242 is an apocalyptic number.

78509242 is a deficient number, since it is larger than the sum of its proper divisors (56581190).

78509242 is a wasteful number, since it uses less digits than its factorization.

78509242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20973.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 78509242 is about 8860.5441142178. The cubic root of 78509242 is about 428.1936883557.

The spelling of 78509242 in words is "seventy-eight million, five hundred nine thousand, two hundred forty-two".