28725738 has 16 divisors (see below), whose sum is σ = 57546336. Its totient is φ = 9559440.

The previous prime is 28725737. The next prime is 28725761. The reversal of 28725738 is 83752782.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28725738.

It is not an unprimeable number, because it can be changed into a prime (28725737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345 + ... + 7587.

It is an arithmetic number, because the mean of its divisors is an integer number (3596646).

Almost surely, 2^28725738 is an apocalyptic number.

28725738 is an abundant number, since it is smaller than the sum of its proper divisors (28820598).

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

28725738 is a wasteful number, since it uses less digits than its factorization.

28725738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7909.

The product of its digits is 188160, while the sum is 42.

The square root of 28725738 is about 5359.6397266981. The cubic root of 28725738 is about 306.2600847436.

The spelling of 28725738 in words is "twenty-eight million, seven hundred twenty-five thousand, seven hundred thirty-eight".