79742281 has 4 divisors (see below), whose sum is σ = 79816464. Its totient is φ = 79668100.

The previous prime is 79742269. The next prime is 79742287. The reversal of 79742281 is 18224797.

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 79742281 - 2⁵ = 79742249 is a prime.

It is a super-2 number, since 2×79742281² = 12717662758165922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79742287) 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, 35455 + ... + 37636.

It is an arithmetic number, because the mean of its divisors is an integer number (19954116).

Almost surely, 2^79742281 is an apocalyptic number.

It is an amenable number.

79742281 is a deficient number, since it is larger than the sum of its proper divisors (74183).

79742281 is a wasteful number, since it uses less digits than its factorization.

79742281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74182.

The product of its digits is 56448, while the sum is 40.

The square root of 79742281 is about 8929.8533582585. The cubic root of 79742281 is about 430.4237412940.

The spelling of 79742281 in words is "seventy-nine million, seven hundred forty-two thousand, two hundred eighty-one".