79428247 has 4 divisors (see below), whose sum is σ = 79485336. Its totient is φ = 79371160.

The previous prime is 79428241. The next prime is 79428253. The reversal of 79428247 is 74282497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74282497 = 233 ⋅318809.

It is an interprime number because it is at equal distance from previous prime (79428241) and next prime (79428253).

It is a cyclic number.

It is not a de Polignac number, because 79428247 - 2¹⁵ = 79395479 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 (79428241) 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, 26404 + ... + 29257.

It is an arithmetic number, because the mean of its divisors is an integer number (19871334).

Almost surely, 2^79428247 is an apocalyptic number.

79428247 is a deficient number, since it is larger than the sum of its proper divisors (57089).

79428247 is a wasteful number, since it uses less digits than its factorization.

79428247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57088.

The product of its digits is 225792, while the sum is 43.

The square root of 79428247 is about 8912.2526333133. The cubic root of 79428247 is about 429.8579790583.

The spelling of 79428247 in words is "seventy-nine million, four hundred twenty-eight thousand, two hundred forty-seven".