78516449 has 4 divisors (see below), whose sum is σ = 85654320. Its totient is φ = 71378580.

The previous prime is 78516437. The next prime is 78516469. The reversal of 78516449 is 94461587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78516449 - 2¹² = 78512353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78516419) by changing a digit.

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, 3568919 + ... + 3568940.

It is an arithmetic number, because the mean of its divisors is an integer number (21413580).

Almost surely, 2^78516449 is an apocalyptic number.

It is an amenable number.

78516449 is a deficient number, since it is larger than the sum of its proper divisors (7137871).

78516449 is a wasteful number, since it uses less digits than its factorization.

78516449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7137870.

The product of its digits is 241920, while the sum is 44.

The square root of 78516449 is about 8860.9507954846. The cubic root of 78516449 is about 428.2067904118.

The spelling of 78516449 in words is "seventy-eight million, five hundred sixteen thousand, four hundred forty-nine".