8638428 has 24 divisors (see below), whose sum is σ = 20442240. Its totient is φ = 2838640.

The previous prime is 8638411. The next prime is 8638447. The reversal of 8638428 is 8248368.

It is a super-2 number, since 2×8638428² = 149244876622368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4218 + ... + 5921.

It is an arithmetic number, because the mean of its divisors is an integer number (851760).

Almost surely, 2^8638428 is an apocalyptic number.

It is an amenable number.

8638428 is an abundant number, since it is smaller than the sum of its proper divisors (11803812).

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

8638428 is a wasteful number, since it uses less digits than its factorization.

8638428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10217 (or 10215 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 8638428 is about 2939.1202765453. The cubic root of 8638428 is about 205.1846680214.

The spelling of 8638428 in words is "eight million, six hundred thirty-eight thousand, four hundred twenty-eight".