79143457 has 4 divisors (see below), whose sum is σ = 79199380. Its totient is φ = 79087536.

The previous prime is 79143451. The next prime is 79143541. The reversal of 79143457 is 75434197.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69956496 + 9186961 = 8364^2 + 3031^2 .

It is a cyclic number.

It is not a de Polignac number, because 79143457 - 2⁷ = 79143329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79143451) 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, 25782 + ... + 28687.

It is an arithmetic number, because the mean of its divisors is an integer number (19799845).

Almost surely, 2^79143457 is an apocalyptic number.

It is an amenable number.

79143457 is a deficient number, since it is larger than the sum of its proper divisors (55923).

79143457 is a wasteful number, since it uses less digits than its factorization.

79143457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55922.

The product of its digits is 105840, while the sum is 40.

The square root of 79143457 is about 8896.2608437478. The cubic root of 79143457 is about 429.3436118483.

The spelling of 79143457 in words is "seventy-nine million, one hundred forty-three thousand, four hundred fifty-seven".