84857657 has 2 divisors, whose sum is σ = 84857658. Its totient is φ = 84857656.

The previous prime is 84857639. The next prime is 84857677. The reversal of 84857657 is 75675848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83521321 + 1336336 = 9139^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 84857657 - 2¹⁰ = 84856633 is a prime.

It is not a weakly prime, because it can be changed into another prime (84857677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42428828 + 42428829.

It is an arithmetic number, because the mean of its divisors is an integer number (42428829).

Almost surely, 2^84857657 is an apocalyptic number.

It is an amenable number.

84857657 is a deficient number, since it is larger than the sum of its proper divisors (1).

84857657 is an equidigital number, since it uses as much as digits as its factorization.

84857657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1881600, while the sum is 50.

The square root of 84857657 is about 9211.8215896749. The cubic root of 84857657 is about 439.4373956040.

The spelling of 84857657 in words is "eighty-four million, eight hundred fifty-seven thousand, six hundred fifty-seven".