172640853 has 48 divisors (see below), whose sum is σ = 319353216. Its totient is φ = 87246720.

The previous prime is 172640813. The next prime is 172640861. The reversal of 172640853 is 358046271.

172640853 is a `hidden beast` number, since 1 + 7 + 2 + 640 + 8 + 5 + 3 = 666.

It is not a de Polignac number, because 172640853 - 2⁶ = 172640789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172640803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22275 + ... + 29007.

It is an arithmetic number, because the mean of its divisors is an integer number (6653192).

Almost surely, 2^172640853 is an apocalyptic number.

It is an amenable number.

172640853 is a deficient number, since it is larger than the sum of its proper divisors (146712363).

172640853 is a wasteful number, since it uses less digits than its factorization.

172640853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6794 (or 6791 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 172640853 is about 13139.2866244709. The cubic root of 172640853 is about 556.8196133134.

The spelling of 172640853 in words is "one hundred seventy-two million, six hundred forty thousand, eight hundred fifty-three".