28917792 has 144 divisors (see below), whose sum is σ = 88058880. Its totient is φ = 8985600.

The previous prime is 28917767. The next prime is 28917797. The reversal of 28917792 is 29771982.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (28917797) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 366009 + ... + 366087.

It is an arithmetic number, because the mean of its divisors is an integer number (611520).

Almost surely, 2^28917792 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 28917792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44029440).

28917792 is an abundant number, since it is smaller than the sum of its proper divisors (59141088).

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

28917792 is a wasteful number, since it uses less digits than its factorization.

28917792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 156 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 28917792 is about 5377.5265689720. The cubic root of 28917792 is about 306.9410985967.

It can be divided in two parts, 289 and 17792, that added together give a palindrome (18081).

The spelling of 28917792 in words is "twenty-eight million, nine hundred seventeen thousand, seven hundred ninety-two".