28729688 has 16 divisors (see below), whose sum is σ = 58012080. Its totient is φ = 13259808.

The previous prime is 28729681. The next prime is 28729717. The reversal of 28729688 is 88692782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28729681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138020 + ... + 138227.

It is an arithmetic number, because the mean of its divisors is an integer number (3625755).

Almost surely, 2^28729688 is an apocalyptic number.

It is an amenable number.

28729688 is an abundant number, since it is smaller than the sum of its proper divisors (29282392).

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

28729688 is a wasteful number, since it uses less digits than its factorization.

28729688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276266 (or 276262 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The square root of 28729688 is about 5360.0082089489. The cubic root of 28729688 is about 306.2741217707.

The spelling of 28729688 in words is "twenty-eight million, seven hundred twenty-nine thousand, six hundred eighty-eight".