78756049 has 4 divisors (see below), whose sum is σ = 78943540. Its totient is φ = 78568560.

The previous prime is 78755987. The next prime is 78756059. The reversal of 78756049 is 94065787.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10445824 + 68310225 = 3232^2 + 8265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78756049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78756059) 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 3 ways as a sum of consecutive naturals, for example, 93114 + ... + 93955.

It is an arithmetic number, because the mean of its divisors is an integer number (19735885).

Almost surely, 2^78756049 is an apocalyptic number.

It is an amenable number.

78756049 is a deficient number, since it is larger than the sum of its proper divisors (187491).

78756049 is a wasteful number, since it uses less digits than its factorization.

78756049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187490.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 78756049 is about 8874.4604906439. The cubic root of 78756049 is about 428.6419186012.

It can be divided in two parts, 7875 and 6049, that added together give a square (13924 = 118²).

The spelling of 78756049 in words is "seventy-eight million, seven hundred fifty-six thousand, forty-nine".