28940775 has 12 divisors (see below), whose sum is σ = 47848872. Its totient is φ = 15435040.

The previous prime is 28940731. The next prime is 28940789. The reversal of 28940775 is 57704982.

It is not a de Polignac number, because 28940775 - 2¹⁶ = 28875239 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192864 + ... + 193013.

It is an arithmetic number, because the mean of its divisors is an integer number (3987406).

Almost surely, 2^28940775 is an apocalyptic number.

28940775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28940775 is a deficient number, since it is larger than the sum of its proper divisors (18908097).

28940775 is a wasteful number, since it uses less digits than its factorization.

28940775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385890 (or 385885 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 28940775 is about 5379.6630935403. The cubic root of 28940775 is about 307.0223929455.

The spelling of 28940775 in words is "twenty-eight million, nine hundred forty thousand, seven hundred seventy-five".