8420070857 has 16 divisors (see below), whose sum is σ = 9278432064. Its totient is φ = 7577304000.

The previous prime is 8420070853. The next prime is 8420070863. The reversal of 8420070857 is 7580700248.

It is a cyclic number.

It is not a de Polignac number, because 8420070857 - 2² = 8420070853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8420070853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2612507 + ... + 2615727.

It is an arithmetic number, because the mean of its divisors is an integer number (579902004).

Almost surely, 2^8420070857 is an apocalyptic number.

It is an amenable number.

8420070857 is a deficient number, since it is larger than the sum of its proper divisors (858361207).

8420070857 is a wasteful number, since it uses less digits than its factorization.

8420070857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560.

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 8420070857 is about 91760.9440720833. The cubic root of 8420070857 is about 2034.4104691593.

The spelling of 8420070857 in words is "eight billion, four hundred twenty million, seventy thousand, eight hundred fifty-seven".