3721720172 has 24 divisors (see below), whose sum is σ = 6908804784. Its totient is φ = 1748178432.

The previous prime is 3721720139. The next prime is 3721720181. The reversal of 3721720172 is 2710271273.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12833 + ... + 87224.

It is an arithmetic number, because the mean of its divisors is an integer number (287866866).

Almost surely, 2^3721720172 is an apocalyptic number.

It is an amenable number.

3721720172 is a deficient number, since it is larger than the sum of its proper divisors (3187084612).

3721720172 is a wasteful number, since it uses less digits than its factorization.

3721720172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100625 (or 100623 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 3721720172 is about 61005.9027635851. The cubic root of 3721720172 is about 1549.7009720755.

The spelling of 3721720172 in words is "three billion, seven hundred twenty-one million, seven hundred twenty thousand, one hundred seventy-two".