172101073428 has 18 divisors (see below), whose sum is σ = 435033269034. Its totient is φ = 57367024464.

The previous prime is 172101073343. The next prime is 172101073433. The reversal of 172101073428 is 824370101271.

172101073428 is a `hidden beast` number, since 1 + 7 + 210 + 10 + 7 + 3 + 428 = 666.

It can be written as a sum of positive squares in only one way, i.e., 143983820304 + 28117253124 = 379452^2 + 167682^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4780585373 = 172101073428 / (1 + 7 + 2 + 1 + 0 + 1 + 0 + 7 + 3 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 172101073392 and 172101073401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2390292651 + ... + 2390292722.

Almost surely, 2^172101073428 is an apocalyptic number.

172101073428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

172101073428 is an abundant number, since it is smaller than the sum of its proper divisors (262932195606).

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

172101073428 is a wasteful number, since it uses less digits than its factorization.

172101073428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780585383 (or 4780585378 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

Adding to 172101073428 its reverse (824370101271), we get a palindrome (996471174699).

The spelling of 172101073428 in words is "one hundred seventy-two billion, one hundred one million, seventy-three thousand, four hundred twenty-eight".