172120772 has 48 divisors (see below), whose sum is σ = 325812480. Its totient is φ = 79315200.

The previous prime is 172120757. The next prime is 172120783. The reversal of 172120772 is 277021271.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 634997 + ... + 635267.

It is an arithmetic number, because the mean of its divisors is an integer number (6787760).

Almost surely, 2^172120772 is an apocalyptic number.

It is an amenable number.

172120772 is a deficient number, since it is larger than the sum of its proper divisors (153691708).

172120772 is a wasteful number, since it uses less digits than its factorization.

172120772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 172120772 is about 13119.4806299640. The cubic root of 172120772 is about 556.2599107438.

The spelling of 172120772 in words is "one hundred seventy-two million, one hundred twenty thousand, seven hundred seventy-two".