28028750 has 40 divisors (see below), whose sum is σ = 55669680. Its totient is φ = 10544000.

The previous prime is 28028747. The next prime is 28028753. The reversal of 28028750 is 5782082.

It is an interprime number because it is at equal distance from previous prime (28028747) and next prime (28028753).

It is a super-2 number, since 2×28028750² = 1571221653125000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028753) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20591 + ... + 21909.

It is an arithmetic number, because the mean of its divisors is an integer number (1391742).

Almost surely, 2^28028750 is an apocalyptic number.

28028750 is a deficient number, since it is larger than the sum of its proper divisors (27640930).

28028750 is a wasteful number, since it uses less digits than its factorization.

28028750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358 (or 1343 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 28028750 is about 5294.2185447902. The cubic root of 28028750 is about 303.7627925088.

The spelling of 28028750 in words is "twenty-eight million, twenty-eight thousand, seven hundred fifty".