79891477 has 4 divisors (see below), whose sum is σ = 79935660. Its totient is φ = 79847296.

The previous prime is 79891457. The next prime is 79891507. The reversal of 79891477 is 77419897.

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 28826161 + 51065316 = 5369^2 + 7146^2 .

It is a cyclic number.

It is not a de Polignac number, because 79891477 - 2⁷ = 79891349 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 (79891417) 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, 19258 + ... + 23035.

It is an arithmetic number, because the mean of its divisors is an integer number (19983915).

Almost surely, 2^79891477 is an apocalyptic number.

It is an amenable number.

79891477 is a deficient number, since it is larger than the sum of its proper divisors (44183).

79891477 is a wasteful number, since it uses less digits than its factorization.

79891477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44182.

The product of its digits is 889056, while the sum is 52.

The square root of 79891477 is about 8938.2032310750. The cubic root of 79891477 is about 430.6920117416.

The spelling of 79891477 in words is "seventy-nine million, eight hundred ninety-one thousand, four hundred seventy-seven".