28729900 has 36 divisors (see below), whose sum is σ = 65629480. Its totient is φ = 10886400.

The previous prime is 28729853. The next prime is 28729903. The reversal of 28729900 is 992782.

It is a self number, because there is not a number n which added to its sum of digits gives 28729900.

It is not an unprimeable number, because it can be changed into a prime (28729903) 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, 5661 + ... + 9460.

Almost surely, 2^28729900 is an apocalyptic number.

28729900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28729900 is an abundant number, since it is smaller than the sum of its proper divisors (36899580).

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

28729900 is a wasteful number, since it uses less digits than its factorization.

28729900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15154 (or 15147 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 28729900 is about 5360.0279850016. The cubic root of 28729900 is about 306.2748751140.

The spelling of 28729900 in words is "twenty-eight million, seven hundred twenty-nine thousand, nine hundred".