83420857 has 8 divisors (see below), whose sum is σ = 90848520. Its totient is φ = 76137600.

The previous prime is 83420837. The next prime is 83420863. The reversal of 83420857 is 75802438.

It can be written as a sum of positive squares in 4 ways, for example, as 1771561 + 81649296 = 1331^2 + 9036^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83420857 is a prime.

It is a super-2 number, since 2×83420857² = 13918078765228898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83420837) 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, 34894 + ... + 37207.

It is an arithmetic number, because the mean of its divisors is an integer number (11356065).

Almost surely, 2^83420857 is an apocalyptic number.

It is an amenable number.

83420857 is a deficient number, since it is larger than the sum of its proper divisors (7427663).

83420857 is a wasteful number, since it uses less digits than its factorization.

83420857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72203.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 83420857 is about 9133.5019023374. The cubic root of 83420857 is about 436.9430967944.

The spelling of 83420857 in words is "eighty-three million, four hundred twenty thousand, eight hundred fifty-seven".