28723136 has 112 divisors (see below), whose sum is σ = 68275200. Its totient is φ = 11860992.

The previous prime is 28723129. The next prime is 28723169. The reversal of 28723136 is 63132782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 363545 + ... + 363623.

It is an arithmetic number, because the mean of its divisors is an integer number (609600).

Almost surely, 2^28723136 is an apocalyptic number.

28723136 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 28723136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34137600).

28723136 is an abundant number, since it is smaller than the sum of its proper divisors (39552064).

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

28723136 is a wasteful number, since it uses less digits than its factorization.

28723136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146 (or 136 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 28723136 is about 5359.3969810045. The cubic root of 28723136 is about 306.2508373710.

The spelling of 28723136 in words is "twenty-eight million, seven hundred twenty-three thousand, one hundred thirty-six".