28899400 has 24 divisors (see below), whose sum is σ = 67191570. Its totient is φ = 11559680.

The previous prime is 28899391. The next prime is 28899401. The reversal of 28899400 is 499882.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 11710084 + 17189316 = 3422^2 + 4146^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (28899401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72049 + ... + 72448.

Almost surely, 2^28899400 is an apocalyptic number.

28899400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28899400 is an abundant number, since it is smaller than the sum of its proper divisors (38292170).

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

28899400 is a wasteful number, since it uses less digits than its factorization.

28899400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144513 (or 144504 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28899400 is about 5375.8162170967. The cubic root of 28899400 is about 306.8760122775.

The spelling of 28899400 in words is "twenty-eight million, eight hundred ninety-nine thousand, four hundred".