79142649 has 4 divisors (see below), whose sum is σ = 105523536. Its totient is φ = 52761764.

The previous prime is 79142647. The next prime is 79142663. The reversal of 79142649 is 94624197.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94624197 = 3 ⋅31541399.

It is a cyclic number.

It is not a de Polignac number, because 79142649 - 2¹ = 79142647 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79142649.

It is not an unprimeable number, because it can be changed into a prime (79142641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13190439 + ... + 13190444.

It is an arithmetic number, because the mean of its divisors is an integer number (26380884).

Almost surely, 2^79142649 is an apocalyptic number.

It is an amenable number.

79142649 is a deficient number, since it is larger than the sum of its proper divisors (26380887).

79142649 is a wasteful number, since it uses less digits than its factorization.

79142649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26380886.

The product of its digits is 108864, while the sum is 42.

The square root of 79142649 is about 8896.2154312944. The cubic root of 79142649 is about 429.3421507428.

The spelling of 79142649 in words is "seventy-nine million, one hundred forty-two thousand, six hundred forty-nine".