28705758 has 16 divisors (see below), whose sum is σ = 60788880. Its totient is φ = 9005696.

The previous prime is 28705727. The next prime is 28705759. The reversal of 28705758 is 85750782.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28705759) 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, 140613 + ... + 140816.

It is an arithmetic number, because the mean of its divisors is an integer number (3799305).

Almost surely, 2^28705758 is an apocalyptic number.

28705758 is an abundant number, since it is smaller than the sum of its proper divisors (32083122).

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

28705758 is a wasteful number, since it uses less digits than its factorization.

28705758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281451.

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 28705758 is about 5357.7754712194. The cubic root of 28705758 is about 306.1890625388.

The spelling of 28705758 in words is "twenty-eight million, seven hundred five thousand, seven hundred fifty-eight".