423178891128 has 128 divisors (see below), whose sum is σ = 1343629900800. Its totient is φ = 120889819008.

The previous prime is 423178891127. The next prime is 423178891171. The reversal of 423178891128 is 821198871324.

423178891128 is a `hidden beast` number, since 42 + 317 + 88 + 91 + 128 = 666.

It is a super-2 number, since 2×423178891128² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423178891127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12219325 + ... + 12253907.

It is an arithmetic number, because the mean of its divisors is an integer number (10497108600).

Almost surely, 2^423178891128 is an apocalyptic number.

It is an amenable number.

423178891128 is an abundant number, since it is smaller than the sum of its proper divisors (920451009672).

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

423178891128 is a wasteful number, since it uses less digits than its factorization.

423178891128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42698 (or 42688 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 54.

The spelling of 423178891128 in words is "four hundred twenty-three billion, one hundred seventy-eight million, eight hundred ninety-one thousand, one hundred twenty-eight".