812172744 has 80 divisors (see below), whose sum is σ = 2281527600. Its totient is φ = 269928288.

The previous prime is 812172707. The next prime is 812172749. The reversal of 812172744 is 447271218.

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 = 812172699 and 812172708.

It is not an unprimeable number, because it can be changed into a prime (812172749) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 243939 + ... + 247245.

It is an arithmetic number, because the mean of its divisors is an integer number (28519095).

Almost surely, 2^812172744 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 812172744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1140763800).

812172744 is an abundant number, since it is smaller than the sum of its proper divisors (1469354856).

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

812172744 is a wasteful number, since it uses less digits than its factorization.

812172744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704 (or 3691 counting only the distinct ones).

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

The square root of 812172744 is about 28498.6445993489. The cubic root of 812172744 is about 933.0024916963.

The spelling of 812172744 in words is "eight hundred twelve million, one hundred seventy-two thousand, seven hundred forty-four".