172660313227428 has 72 divisors (see below), whose sum is σ = 472072229811000. Its totient is φ = 52894257831936.

The previous prime is 172660313227421. The next prime is 172660313227489. The reversal of 172660313227428 is 824722313066271.

172660313227428 is a `hidden beast` number, since 1 + 7 + 2 + 6 + 60 + 3 + 132 + 27 + 428 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 46625517010944 + 126034796216484 = 6828288^2 + 11226522^2 .

It is not an unprimeable number, because it can be changed into a prime (172660313227421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 805421853 + ... + 805636196.

It is an arithmetic number, because the mean of its divisors is an integer number (6556558747375).

Almost surely, 2^{172660313227428} is an apocalyptic number.

172660313227428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

172660313227428 is an abundant number, since it is smaller than the sum of its proper divisors (299411916583572).

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

172660313227428 is a wasteful number, since it uses less digits than its factorization.

172660313227428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611058301 (or 1611058296 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 172660313227428 in words is "one hundred seventy-two trillion, six hundred sixty billion, three hundred thirteen million, two hundred twenty-seven thousand, four hundred twenty-eight".