28572156 has 48 divisors (see below), whose sum is σ = 75307680. Its totient is φ = 9365760.

The previous prime is 28572151. The next prime is 28572157. The reversal of 28572156 is 65127582.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28572156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28572151) 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, 4420 + ... + 8756.

It is an arithmetic number, because the mean of its divisors is an integer number (1568910).

Almost surely, 2^28572156 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 28572156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37653840).

28572156 is an abundant number, since it is smaller than the sum of its proper divisors (46735524).

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

28572156 is a wasteful number, since it uses less digits than its factorization.

28572156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4411 (or 4403 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 28572156 is about 5345.2928825276. The cubic root of 28572156 is about 305.7133031757.

The spelling of 28572156 in words is "twenty-eight million, five hundred seventy-two thousand, one hundred fifty-six".