78042755 has 8 divisors (see below), whose sum is σ = 107030112. Its totient is φ = 53515008.

The previous prime is 78042751. The next prime is 78042787. The reversal of 78042755 is 55724087.

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

It is a cyclic number.

It is not a de Polignac number, because 78042755 - 2² = 78042751 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78042751) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1114862 + ... + 1114931.

It is an arithmetic number, because the mean of its divisors is an integer number (13378764).

Almost surely, 2^78042755 is an apocalyptic number.

78042755 is a deficient number, since it is larger than the sum of its proper divisors (28987357).

78042755 is a wasteful number, since it uses less digits than its factorization.

78042755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2229805.

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 78042755 is about 8834.1810599512. The cubic root of 78042755 is about 427.3439212272.

The spelling of 78042755 in words is "seventy-eight million, forty-two thousand, seven hundred fifty-five".