10172720844 has 72 divisors (see below), whose sum is σ = 30209913552. Its totient is φ = 2845514880.

The previous prime is 10172720813. The next prime is 10172720849. The reversal of 10172720844 is 44802727101.

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

It is a junction number, because it is equal to n+sod(n) for n = 10172720799 and 10172720808.

It is not an unprimeable number, because it can be changed into a prime (10172720849) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 982879 + ... + 993174.

Almost surely, 2^10172720844 is an apocalyptic number.

It is an amenable number.

10172720844 is an abundant number, since it is smaller than the sum of its proper divisors (20037192708).

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

10172720844 is a wasteful number, since it uses less digits than its factorization.

10172720844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976087 (or 1976082 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The spelling of 10172720844 in words is "ten billion, one hundred seventy-two million, seven hundred twenty thousand, eight hundred forty-four".