28173756 has 48 divisors (see below), whose sum is σ = 71144864. Its totient is φ = 8626176.

The previous prime is 28173721. The next prime is 28173757. The reversal of 28173756 is 65737182.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173757) 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, 48540 + ... + 49116.

Almost surely, 2^28173756 is an apocalyptic number.

28173756 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28173756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35572432).

28173756 is an abundant number, since it is smaller than the sum of its proper divisors (42971108).

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

28173756 is a wasteful number, since it uses less digits than its factorization.

28173756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 908 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 28173756 is about 5307.8956282127. The cubic root of 28173756 is about 304.2857280144.

The spelling of 28173756 in words is "twenty-eight million, one hundred seventy-three thousand, seven hundred fifty-six".