172690157 has 8 divisors (see below), whose sum is σ = 179682840. Its totient is φ = 165766720.

The previous prime is 172690151. The next prime is 172690163. The reversal of 172690157 is 751096271.

172690157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (172690151) and next prime (172690163).

It can be written as a sum of positive squares in 4 ways, for example, as 116229961 + 56460196 = 10781^2 + 7514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172690157 - 2¹⁰ = 172689133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172690157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172690151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12194 + ... + 22227.

It is an arithmetic number, because the mean of its divisors is an integer number (22460355).

Almost surely, 2^172690157 is an apocalyptic number.

It is an amenable number.

172690157 is a deficient number, since it is larger than the sum of its proper divisors (6992683).

172690157 is a wasteful number, since it uses less digits than its factorization.

172690157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34623.

The product of its (nonzero) digits is 26460, while the sum is 38.

The square root of 172690157 is about 13141.1626958957. The cubic root of 172690157 is about 556.8726151004.

The spelling of 172690157 in words is "one hundred seventy-two million, six hundred ninety thousand, one hundred fifty-seven".