28961712 has 140 divisors (see below), whose sum is σ = 91077504. Its totient is φ = 8864640.

The previous prime is 28961711. The next prime is 28961717. The reversal of 28961712 is 21716982.

28961712 is a `hidden beast` number, since 28 + 9 + 617 + 12 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (28961711) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 151537 + ... + 151727.

Almost surely, 2^28961712 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 28961712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45538752).

28961712 is an abundant number, since it is smaller than the sum of its proper divisors (62115792).

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

28961712 is a wasteful number, since it uses less digits than its factorization.

28961712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 209 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 28961712 is about 5381.6086814260. The cubic root of 28961712 is about 307.0964128285.

It can be divided in two parts, 289 and 61712, that added together give a square (62001 = 249²).

The spelling of 28961712 in words is "twenty-eight million, nine hundred sixty-one thousand, seven hundred twelve".