84915857 has 8 divisors (see below), whose sum is σ = 94601640. Its totient is φ = 75680640.

The previous prime is 84915847. The next prime is 84915869. The reversal of 84915857 is 75851948.

It can be written as a sum of positive squares in 4 ways, for example, as 1175056 + 83740801 = 1084^2 + 9151^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84915857 - 2²⁴ = 68138641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84915847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112244 + ... + 112997.

It is an arithmetic number, because the mean of its divisors is an integer number (11825205).

Almost surely, 2^84915857 is an apocalyptic number.

It is an amenable number.

84915857 is a deficient number, since it is larger than the sum of its proper divisors (9685783).

84915857 is a wasteful number, since it uses less digits than its factorization.

84915857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225283.

The product of its digits is 403200, while the sum is 47.

The square root of 84915857 is about 9214.9800325340. The cubic root of 84915857 is about 439.5378360065.

The spelling of 84915857 in words is "eighty-four million, nine hundred fifteen thousand, eight hundred fifty-seven".