172288620 has 120 divisors (see below), whose sum is σ = 617727264. Its totient is φ = 39377664.

The previous prime is 172288577. The next prime is 172288663. The reversal of 172288620 is 26882271.

It is a happy number.

172288620 is a `hidden beast` number, since 1 + 7 + 2 + 28 + 8 + 620 = 666.

It is an interprime number because it is at equal distance from previous prime (172288577) and next prime (172288663).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 3744 + ... + 18936.

Almost surely, 2^172288620 is an apocalyptic number.

172288620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172288620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308863632).

172288620 is an abundant number, since it is smaller than the sum of its proper divisors (445438644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172288620 is a wasteful number, since it uses less digits than its factorization.

172288620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15221 (or 15210 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 172288620 is about 13125.8759707686. The cubic root of 172288620 is about 556.4406690548.

The spelling of 172288620 in words is "one hundred seventy-two million, two hundred eighty-eight thousand, six hundred twenty".