78536642 has 8 divisors (see below), whose sum is σ = 118121916. Its totient is φ = 39162672.

The previous prime is 78536641. The next prime is 78536657. The reversal of 78536642 is 24663587.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78517321 + 19321 = 8861^2 + 139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78536642.

It is not an unprimeable number, because it can be changed into a prime (78536641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51893 + ... + 53384.

Almost surely, 2^78536642 is an apocalyptic number.

78536642 is a deficient number, since it is larger than the sum of its proper divisors (39585274).

78536642 is a wasteful number, since it uses less digits than its factorization.

78536642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105652.

The product of its digits is 241920, while the sum is 41.

The square root of 78536642 is about 8862.0901597761. The cubic root of 78536642 is about 428.2434962600.

The spelling of 78536642 in words is "seventy-eight million, five hundred thirty-six thousand, six hundred forty-two".