78752549 has 4 divisors (see below), whose sum is σ = 82897440. Its totient is φ = 74607660.

The previous prime is 78752501. The next prime is 78752563. The reversal of 78752549 is 94525787.

It is a happy number.

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 78752549 - 2²⁰ = 77703973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78752599) 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, 2072417 + ... + 2072454.

It is an arithmetic number, because the mean of its divisors is an integer number (20724360).

Almost surely, 2^78752549 is an apocalyptic number.

It is an amenable number.

78752549 is a deficient number, since it is larger than the sum of its proper divisors (4144891).

78752549 is a wasteful number, since it uses less digits than its factorization.

78752549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144890.

The product of its digits is 705600, while the sum is 47.

The square root of 78752549 is about 8874.2632933669. The cubic root of 78752549 is about 428.6355687442.

The spelling of 78752549 in words is "seventy-eight million, seven hundred fifty-two thousand, five hundred forty-nine".