28707864 has 64 divisors (see below), whose sum is σ = 75651840. Its totient is φ = 9060480.

The previous prime is 28707863. The next prime is 28707869. The reversal of 28707864 is 46870782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28707863) 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, 72114 + ... + 72510.

It is an arithmetic number, because the mean of its divisors is an integer number (1182060).

Almost surely, 2^28707864 is an apocalyptic number.

28707864 is a gapful number since it is divisible by the number (24) 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 28707864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37825920).

28707864 is an abundant number, since it is smaller than the sum of its proper divisors (46943976).

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

28707864 is a wasteful number, since it uses less digits than its factorization.

28707864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 28707864 is about 5357.9720044061. The cubic root of 28707864 is about 306.1965502166.

The spelling of 28707864 in words is "twenty-eight million, seven hundred seven thousand, eight hundred sixty-four".