3928729977172 has 48 divisors (see below), whose sum is σ = 9231141773952. Its totient is φ = 1412929860480.

The previous prime is 3928729977149. The next prime is 3928729977173. The reversal of 3928729977172 is 2717799278293.

It is a super-2 number, since 2×3928729977172² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3928729977095 and 3928729977104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3928729977173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490596643 + ... + 490604650.

It is an arithmetic number, because the mean of its divisors is an integer number (192315453624).

Almost surely, 2^{3928729977172} is an apocalyptic number.

It is an amenable number.

3928729977172 is an abundant number, since it is smaller than the sum of its proper divisors (5302411796780).

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

3928729977172 is a wasteful number, since it uses less digits than its factorization.

3928729977172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981201328 (or 981201326 counting only the distinct ones).

The product of its digits is 336063168, while the sum is 73.

The spelling of 3928729977172 in words is "three trillion, nine hundred twenty-eight billion, seven hundred twenty-nine million, nine hundred seventy-seven thousand, one hundred seventy-two".