84428557 has 4 divisors (see below), whose sum is σ = 84452796. Its totient is φ = 84404320.

The previous prime is 84428537. The next prime is 84428563. The reversal of 84428557 is 75582448.

It is a happy number.

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 36735721 + 47692836 = 6061^2 + 6906^2 .

It is a cyclic number.

It is not a de Polignac number, because 84428557 - 2¹⁵ = 84395789 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 (84428507) 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, 5794 + ... + 14227.

It is an arithmetic number, because the mean of its divisors is an integer number (21113199).

Almost surely, 2^84428557 is an apocalyptic number.

It is an amenable number.

84428557 is a deficient number, since it is larger than the sum of its proper divisors (24239).

84428557 is a wasteful number, since it uses less digits than its factorization.

84428557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24238.

The product of its digits is 358400, while the sum is 43.

The square root of 84428557 is about 9188.5013467921. The cubic root of 84428557 is about 438.6954420625.

The spelling of 84428557 in words is "eighty-four million, four hundred twenty-eight thousand, five hundred fifty-seven".