8428657 has 8 divisors (see below), whose sum is σ = 8692992. Its totient is φ = 8167200.

The previous prime is 8428633. The next prime is 8428661. The reversal of 8428657 is 7568248.

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

It is a de Polignac number, because none of the positive numbers 2^k-8428657 is a prime.

It is a Duffinian number.

8428657 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (8428687) 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, 6232 + ... + 7462.

It is an arithmetic number, because the mean of its divisors is an integer number (1086624).

Almost surely, 2^8428657 is an apocalyptic number.

It is an amenable number.

8428657 is a deficient number, since it is larger than the sum of its proper divisors (264335).

8428657 is a wasteful number, since it uses less digits than its factorization.

8428657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439.

The product of its digits is 107520, while the sum is 40.

The square root of 8428657 is about 2903.2149420944. The cubic root of 8428657 is about 203.5101746206.

The spelling of 8428657 in words is "eight million, four hundred twenty-eight thousand, six hundred fifty-seven".