172491020 has 48 divisors (see below), whose sum is σ = 391546848. Its totient is φ = 63452160.

The previous prime is 172490999. The next prime is 172491041. The reversal of 172491020 is 20194271.

It is an interprime number because it is at equal distance from previous prime (172490999) and next prime (172491041).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78740 + ... + 80900.

It is an arithmetic number, because the mean of its divisors is an integer number (8157226).

Almost surely, 2^172491020 is an apocalyptic number.

172491020 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 172491020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195773424).

172491020 is an abundant number, since it is smaller than the sum of its proper divisors (219055828).

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

172491020 is a wasteful number, since it uses less digits than its factorization.

172491020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490 (or 2488 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 172491020 is about 13133.5836693570. The cubic root of 172491020 is about 556.6584809215.

The spelling of 172491020 in words is "one hundred seventy-two million, four hundred ninety-one thousand, twenty".