28519500 has 48 divisors (see below), whose sum is σ = 83053152. Its totient is φ = 7604800.

The previous prime is 28519451. The next prime is 28519507. The reversal of 28519500 is 591582.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28519507) 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, 8007 + ... + 11006.

It is an arithmetic number, because the mean of its divisors is an integer number (1730274).

Almost surely, 2^28519500 is an apocalyptic number.

28519500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28519500 is an abundant number, since it is smaller than the sum of its proper divisors (54533652).

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

28519500 is a wasteful number, since it uses less digits than its factorization.

28519500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19035 (or 19023 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 28519500 is about 5340.3651560544. The cubic root of 28519500 is about 305.5253866755.

The spelling of 28519500 in words is "twenty-eight million, five hundred nineteen thousand, five hundred".