8428744 has 8 divisors (see below), whose sum is σ = 15803910. Its totient is φ = 4214368.

The previous prime is 8428729. The next prime is 8428759. The reversal of 8428744 is 4478248.

It is an interprime number because it is at equal distance from previous prime (8428729) and next prime (8428759).

It can be written as a sum of positive squares in only one way, i.e., 8236900 + 191844 = 2870^2 + 438^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 526789 + ... + 526804.

Almost surely, 2^8428744 is an apocalyptic number.

It is an amenable number.

8428744 is a deficient number, since it is larger than the sum of its proper divisors (7375166).

8428744 is a wasteful number, since it uses less digits than its factorization.

8428744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053599 (or 1053595 counting only the distinct ones).

The product of its digits is 57344, while the sum is 37.

The square root of 8428744 is about 2903.2299254451. The cubic root of 8428744 is about 203.5108748241.

The spelling of 8428744 in words is "eight million, four hundred twenty-eight thousand, seven hundred forty-four".