8156772 has 72 divisors (see below), whose sum is σ = 23008440. Its totient is φ = 2419200.

The previous prime is 8156767. The next prime is 8156773. The reversal of 8156772 is 2776518.

It can be written as a sum of positive squares in 4 ways, for example, as 1218816 + 6937956 = 1104^2 + 2634^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8156773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13272 + ... + 13872.

Almost surely, 2^8156772 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 8156772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11504220).

8156772 is an abundant number, since it is smaller than the sum of its proper divisors (14851668).

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

8156772 is a wasteful number, since it uses less digits than its factorization.

8156772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 648 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 8156772 is about 2856.0063025141. The cubic root of 8156772 is about 201.2979912039.

Subtracting from 8156772 its sum of digits (36), we obtain a square (8156736 = 2856²).

The spelling of 8156772 in words is "eight million, one hundred fifty-six thousand, seven hundred seventy-two".