842638428 has 36 divisors (see below), whose sum is σ = 2130917880. Its totient is φ = 280758816.

The previous prime is 842638427. The next prime is 842638451. The reversal of 842638428 is 824836248.

842638428 is a `hidden beast` number, since 8 + 4 + 2 + 638 + 4 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×842638428² = 1420079040684622368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (842638421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128526 + ... + 134922.

Almost surely, 2^842638428 is an apocalyptic number.

It is an amenable number.

842638428 is an abundant number, since it is smaller than the sum of its proper divisors (1288279452).

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

842638428 is a wasteful number, since it uses less digits than its factorization.

842638428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10066 (or 10061 counting only the distinct ones).

The product of its digits is 589824, while the sum is 45.

The square root of 842638428 is about 29028.2350135174. The cubic root of 842638428 is about 944.5256441845.

The spelling of 842638428 in words is "eight hundred forty-two million, six hundred thirty-eight thousand, four hundred twenty-eight".