2720172 has 96 divisors (see below), whose sum is σ = 8128512. Its totient is φ = 688896.

The previous prime is 2720149. The next prime is 2720183. The reversal of 2720172 is 2710272.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51298 + ... + 51350.

It is an arithmetic number, because the mean of its divisors is an integer number (84672).

2^2720172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2720172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4064256).

2720172 is an abundant number, since it is smaller than the sum of its proper divisors (5408340).

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

2720172 is a wasteful number, since it uses less digits than its factorization.

2720172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 2720172 is about 1649.2943945821. The cubic root of 2720172 is about 139.5935832279.

It can be divided in two parts, 27 and 20172, that multiplied together give a square (544644 = 738²).

The spelling of 2720172 in words is "two million, seven hundred twenty thousand, one hundred seventy-two".