189236281428 has 60 divisors (see below), whose sum is σ = 504035046900. Its totient is φ = 61888589568.

The previous prime is 189236281427. The next prime is 189236281447. The reversal of 189236281428 is 824182632981.

189236281428 is a `hidden beast` number, since 1 + 8 + 9 + 2 + 3 + 628 + 1 + 4 + 2 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 99804182724 + 89432098704 = 315918^2 + 299052^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189236281427) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5492853 + ... + 5527196.

It is an arithmetic number, because the mean of its divisors is an integer number (8400584115).

Almost surely, 2^189236281428 is an apocalyptic number.

189236281428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

189236281428 is an abundant number, since it is smaller than the sum of its proper divisors (314798765472).

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

189236281428 is a wasteful number, since it uses less digits than its factorization.

189236281428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11020118 (or 11020107 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The spelling of 189236281428 in words is "one hundred eighty-nine billion, two hundred thirty-six million, two hundred eighty-one thousand, four hundred twenty-eight".