84709238477 has 4 divisors (see below), whose sum is σ = 89692134876. Its totient is φ = 79726342080.

The previous prime is 84709238447. The next prime is 84709238479. The reversal of 84709238477 is 77483290748.

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 45989231401 + 38720007076 = 214451^2 + 196774^2 .

It is a cyclic number.

It is not a de Polignac number, because 84709238477 - 2¹² = 84709234381 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 (84709238479) 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, 2491448174 + ... + 2491448207.

It is an arithmetic number, because the mean of its divisors is an integer number (22423033719).

Almost surely, 2^84709238477 is an apocalyptic number.

It is an amenable number.

84709238477 is a deficient number, since it is larger than the sum of its proper divisors (4982896399).

84709238477 is a wasteful number, since it uses less digits than its factorization.

84709238477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4982896398.

The product of its (nonzero) digits is 18966528, while the sum is 59.

The spelling of 84709238477 in words is "eighty-four billion, seven hundred nine million, two hundred thirty-eight thousand, four hundred seventy-seven".