79487749 has 4 divisors (see below), whose sum is σ = 86713920. Its totient is φ = 72261580.

The previous prime is 79487713. The next prime is 79487761. The reversal of 79487749 is 94778497.

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 79487749 - 2⁹ = 79487237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79487749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79487789) 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, 3613069 + ... + 3613090.

It is an arithmetic number, because the mean of its divisors is an integer number (21678480).

Almost surely, 2^79487749 is an apocalyptic number.

It is an amenable number.

79487749 is a deficient number, since it is larger than the sum of its proper divisors (7226171).

79487749 is a wasteful number, since it uses less digits than its factorization.

79487749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7226170.

The product of its digits is 3556224, while the sum is 55.

The square root of 79487749 is about 8915.5902216286. The cubic root of 79487749 is about 429.9652919525.

The spelling of 79487749 in words is "seventy-nine million, four hundred eighty-seven thousand, seven hundred forty-nine".