172020650 has 12 divisors (see below), whose sum is σ = 319958502. Its totient is φ = 68808240.

The previous prime is 172020599. The next prime is 172020677. The reversal of 172020650 is 56020271.

It can be written as a sum of positive squares in 3 ways, for example, as 84953089 + 87067561 = 9217^2 + 9331^2 .

It is a super-2 number, since 2×172020650² = 59182208052845000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1720157 + ... + 1720256.

Almost surely, 2^172020650 is an apocalyptic number.

172020650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172020650 is a deficient number, since it is larger than the sum of its proper divisors (147937852).

172020650 is a wasteful number, since it uses less digits than its factorization.

172020650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440425 (or 3440420 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 172020650 is about 13115.6642988451. The cubic root of 172020650 is about 556.1520317303.

The spelling of 172020650 in words is "one hundred seventy-two million, twenty thousand, six hundred fifty".