172437428 has 12 divisors (see below), whose sum is σ = 303019332. Its totient is φ = 85860480.

The previous prime is 172437373. The next prime is 172437437. The reversal of 172437428 is 824734271.

It can be written as a sum of positive squares in 2 ways, for example, as 106956964 + 65480464 = 10342^2 + 8092^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172437391 and 172437400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88475 + ... + 90402.

It is an arithmetic number, because the mean of its divisors is an integer number (25251611).

Almost surely, 2^172437428 is an apocalyptic number.

It is an amenable number.

172437428 is a deficient number, since it is larger than the sum of its proper divisors (130581904).

172437428 is a wasteful number, since it uses less digits than its factorization.

172437428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179122 (or 179120 counting only the distinct ones).

The product of its digits is 75264, while the sum is 38.

The square root of 172437428 is about 13131.5432451788. The cubic root of 172437428 is about 556.6008247192.

The spelling of 172437428 in words is "one hundred seventy-two million, four hundred thirty-seven thousand, four hundred twenty-eight".