28773481 has 8 divisors (see below), whose sum is σ = 32472000. Its totient is φ = 25255440.

The previous prime is 28773473. The next prime is 28773497. The reversal of 28773481 is 18437782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28773481 - 2³ = 28773473 is a prime.

It is a super-2 number, since 2×28773481² = 1655826417714722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28773181) 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 7 ways as a sum of consecutive naturals, for example, 44781 + ... + 45418.

It is an arithmetic number, because the mean of its divisors is an integer number (4059000).

Almost surely, 2^28773481 is an apocalyptic number.

It is an amenable number.

28773481 is a deficient number, since it is larger than the sum of its proper divisors (3698519).

28773481 is a wasteful number, since it uses less digits than its factorization.

28773481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90239.

The product of its digits is 75264, while the sum is 40.

The square root of 28773481 is about 5364.0918150233. The cubic root of 28773481 is about 306.4296618442.

The spelling of 28773481 in words is "twenty-eight million, seven hundred seventy-three thousand, four hundred eighty-one".