172776897 has 12 divisors (see below), whose sum is σ = 260417664. Its totient is φ = 110176440.

The previous prime is 172776889. The next prime is 172776907. The reversal of 172776897 is 798677271.

It is not a de Polignac number, because 172776897 - 2³ = 172776889 is a prime.

It is a super-2 number, since 2×172776897² = 59703712273897218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172776847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417129 + ... + 417542.

It is an arithmetic number, because the mean of its divisors is an integer number (21701472).

Almost surely, 2^172776897 is an apocalyptic number.

It is an amenable number.

172776897 is a deficient number, since it is larger than the sum of its proper divisors (87640767).

172776897 is a wasteful number, since it uses less digits than its factorization.

172776897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834700 (or 834697 counting only the distinct ones).

The product of its digits is 2074464, while the sum is 54.

The square root of 172776897 is about 13144.4625983720. The cubic root of 172776897 is about 556.9658360969.

The spelling of 172776897 in words is "one hundred seventy-two million, seven hundred seventy-six thousand, eight hundred ninety-seven".