172989663 has 32 divisors (see below), whose sum is σ = 288921600. Its totient is φ = 89441760.

The previous prime is 172989659. The next prime is 172989667. The reversal of 172989663 is 366989271.

It is an interprime number because it is at equal distance from previous prime (172989659) and next prime (172989667).

It is not a de Polignac number, because 172989663 - 2² = 172989659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172989667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50788 + ... + 54086.

It is an arithmetic number, because the mean of its divisors is an integer number (9028800).

Almost surely, 2^172989663 is an apocalyptic number.

172989663 is a deficient number, since it is larger than the sum of its proper divisors (115931937).

172989663 is a wasteful number, since it uses less digits than its factorization.

172989663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547.

The product of its digits is 979776, while the sum is 51.

The square root of 172989663 is about 13152.5534783174. The cubic root of 172989663 is about 557.1943673893.

The spelling of 172989663 in words is "one hundred seventy-two million, nine hundred eighty-nine thousand, six hundred sixty-three".