28780375 has 32 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 20908800.

The previous prime is 28780361. The next prime is 28780379. The reversal of 28780375 is 57308782.

It is not a de Polignac number, because 28780375 - 2⁷ = 28780247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144526 + ... + 144724.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^28780375 is an apocalyptic number.

28780375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28780375 is a deficient number, since it is larger than the sum of its proper divisors (10531625).

28780375 is a wasteful number, since it uses less digits than its factorization.

28780375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 28780375 is about 5364.7343829867. The cubic root of 28780375 is about 306.4541329582.

The spelling of 28780375 in words is "twenty-eight million, seven hundred eighty thousand, three hundred seventy-five".