28571428 has 12 divisors (see below), whose sum is σ = 52174080. Its totient is φ = 13664552.

The previous prime is 28571423. The next prime is 28571449. The reversal of 28571428 is 82417582.

28571428 is a modest number, since divided by 571428 gives 28 as remainder.

It is not an unprimeable number, because it can be changed into a prime (28571423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155188 + ... + 155371.

It is an arithmetic number, because the mean of its divisors is an integer number (4347840).

Almost surely, 2^28571428 is an apocalyptic number.

It is an amenable number.

28571428 is a deficient number, since it is larger than the sum of its proper divisors (23602652).

28571428 is a wasteful number, since it uses less digits than its factorization.

28571428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310586 (or 310584 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 28571428 is about 5345.2247847962. The cubic root of 28571428 is about 305.7107066948.

It can be divided in two parts, 2857 and 1428, that multiplied together give a triangular number (4079796 = T₂₈₅₆).

The spelling of 28571428 in words is "twenty-eight million, five hundred seventy-one thousand, four hundred twenty-eight".