28660400 has 60 divisors (see below), whose sum is σ = 69491832. Its totient is φ = 11358720.

The previous prime is 28660397. The next prime is 28660409. The reversal of 28660400 is 406682.

It is a self number, because there is not a number n which added to its sum of digits gives 28660400.

It is not an unprimeable number, because it can be changed into a prime (28660409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54539 + ... + 55061.

Almost surely, 2^28660400 is an apocalyptic number.

28660400 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 28660400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34745916).

28660400 is an abundant number, since it is smaller than the sum of its proper divisors (40831432).

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

28660400 is a wasteful number, since it uses less digits than its factorization.

28660400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 667 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 28660400 is about 5353.5408843120. The cubic root of 28660400 is about 306.0277076310.

The spelling of 28660400 in words is "twenty-eight million, six hundred sixty thousand, four hundred".