28873557 has 32 divisors (see below), whose sum is σ = 44520960. Its totient is φ = 18480960.

The previous prime is 28873549. The next prime is 28873561. The reversal of 28873557 is 75537882.

28873557 is a `hidden beast` number, since 28 + 8 + 73 + 557 = 666.

It is not a de Polignac number, because 28873557 - 2³ = 28873549 is a prime.

Its product of digits (470400) is a multiple of the sum of its prime factors (490).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28873057) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 77223 + ... + 77595.

It is an arithmetic number, because the mean of its divisors is an integer number (1391280).

Almost surely, 2^28873557 is an apocalyptic number.

28873557 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28873557 is a deficient number, since it is larger than the sum of its proper divisors (15647403).

28873557 is a wasteful number, since it uses less digits than its factorization.

28873557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 484 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 28873557 is about 5373.4120445021. The cubic root of 28873557 is about 306.7845113938.

The spelling of 28873557 in words is "twenty-eight million, eight hundred seventy-three thousand, five hundred fifty-seven".