28611700 has 54 divisors (see below), whose sum is σ = 67270434. Its totient is φ = 10558080.

The previous prime is 28611691. The next prime is 28611707. The reversal of 28611700 is 711682.

It can be written as a sum of positive squares in 9 ways, for example, as 19873764 + 8737936 = 4458^2 + 2956^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28611707) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16054 + ... + 17746.

Almost surely, 2^28611700 is an apocalyptic number.

28611700 is a gapful number since it is divisible by the number (20) 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 28611700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33635217).

28611700 is an abundant number, since it is smaller than the sum of its proper divisors (38658734).

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

28611700 is a wasteful number, since it uses less digits than its factorization.

28611700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733 (or 1713 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 28611700 is about 5348.9905589747. The cubic root of 28611700 is about 305.8542743834.

The spelling of 28611700 in words is "twenty-eight million, six hundred eleven thousand, seven hundred".