866728172 has 12 divisors (see below), whose sum is σ = 1542482760. Its totient is φ = 426018816.

The previous prime is 866728157. The next prime is 866728223. The reversal of 866728172 is 271827668.

It is a super-3 number, since 3×866728172³ (a number of 28 digits) contains 333 as substring.

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, 1836053 + ... + 1836524.

It is an arithmetic number, because the mean of its divisors is an integer number (128540230).

Almost surely, 2^866728172 is an apocalyptic number.

It is an amenable number.

866728172 is a deficient number, since it is larger than the sum of its proper divisors (675754588).

866728172 is a wasteful number, since it uses less digits than its factorization.

866728172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3672640 (or 3672638 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 866728172 is about 29440.2474853728. The cubic root of 866728172 is about 953.4420554548.

The spelling of 866728172 in words is "eight hundred sixty-six million, seven hundred twenty-eight thousand, one hundred seventy-two".