172742877 has 12 divisors (see below), whose sum is σ = 249726204. Its totient is φ = 115065600.

The previous prime is 172742827. The next prime is 172742891. The reversal of 172742877 is 778247271.

It can be written as a sum of positive squares in 2 ways, for example, as 27154521 + 145588356 = 5211^2 + 12066^2 .

It is not a de Polignac number, because 172742877 - 2⁸ = 172742621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172742827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4333 + ... + 19085.

It is an arithmetic number, because the mean of its divisors is an integer number (20810517).

Almost surely, 2^172742877 is an apocalyptic number.

It is an amenable number.

172742877 is a deficient number, since it is larger than the sum of its proper divisors (76983327).

172742877 is a wasteful number, since it uses less digits than its factorization.

172742877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16060 (or 16057 counting only the distinct ones).

The product of its digits is 307328, while the sum is 45.

The square root of 172742877 is about 13143.1684536112. The cubic root of 172742877 is about 556.9292779269.

The spelling of 172742877 in words is "one hundred seventy-two million, seven hundred forty-two thousand, eight hundred seventy-seven".