8617428 has 30 divisors (see below), whose sum is σ = 22528506. Its totient is φ = 2872368.

The previous prime is 8617417. The next prime is 8617439. The reversal of 8617428 is 8247168.

It is an interprime number because it is at equal distance from previous prime (8617417) and next prime (8617439).

It can be written as a sum of positive squares in only one way, i.e., 8398404 + 219024 = 2898^2 + 468^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 8617392 and 8617401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12975 + ... + 13622.

Almost surely, 2^8617428 is an apocalyptic number.

It is an amenable number.

8617428 is an abundant number, since it is smaller than the sum of its proper divisors (13911078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8617428 is a wasteful number, since it uses less digits than its factorization.

8617428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26613 (or 26602 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 8617428 is about 2935.5456051644. The cubic root of 8617428 is about 205.0182652772.

It can be divided in two parts, 8617 and 428, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 8617428 in words is "eight million, six hundred seventeen thousand, four hundred twenty-eight".