8457644 has 24 divisors (see below), whose sum is σ = 16332288. Its totient is φ = 3807360.

The previous prime is 8457643. The next prime is 8457649. The reversal of 8457644 is 4467548.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8457598 and 8457607.

It is not an unprimeable number, because it can be changed into a prime (8457643) 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, 149 + ... + 4115.

It is an arithmetic number, because the mean of its divisors is an integer number (680512).

Almost surely, 2^8457644 is an apocalyptic number.

It is an amenable number.

8457644 is a deficient number, since it is larger than the sum of its proper divisors (7874644).

8457644 is a wasteful number, since it uses less digits than its factorization.

8457644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4025 (or 4023 counting only the distinct ones).

The product of its digits is 107520, while the sum is 38.

The square root of 8457644 is about 2908.2028815060. The cubic root of 8457644 is about 203.7432050126.

The spelling of 8457644 in words is "eight million, four hundred fifty-seven thousand, six hundred forty-four".