28951575 has 24 divisors (see below), whose sum is σ = 49165008. Its totient is φ = 15022080.

The previous prime is 28951567. The next prime is 28951591. The reversal of 28951575 is 57515982.

It is not a de Polignac number, because 28951575 - 2³ = 28951567 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2442 + ... + 7991.

It is an arithmetic number, because the mean of its divisors is an integer number (2048542).

Almost surely, 2^28951575 is an apocalyptic number.

28951575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28951575 is a deficient number, since it is larger than the sum of its proper divisors (20213433).

28951575 is a wasteful number, since it uses less digits than its factorization.

28951575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10483 (or 10478 counting only the distinct ones).

The product of its digits is 126000, while the sum is 42.

The square root of 28951575 is about 5380.6667802420. Note that the first 3 decimals coincide. The cubic root of 28951575 is about 307.0605793159.

The spelling of 28951575 in words is "twenty-eight million, nine hundred fifty-one thousand, five hundred seventy-five".