28770481 has 4 divisors (see below), whose sum is σ = 29039472. Its totient is φ = 28501492.

The previous prime is 28770473. The next prime is 28770509. The reversal of 28770481 is 18407782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18407782 = 2 ⋅9203891.

It is a cyclic number.

It is not a de Polignac number, because 28770481 - 2³ = 28770473 is a prime.

It is a super-2 number, since 2×28770481² = 1655481153942722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28770481.

It is not an unprimeable number, because it can be changed into a prime (28770421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134335 + ... + 134548.

It is an arithmetic number, because the mean of its divisors is an integer number (7259868).

Almost surely, 2^28770481 is an apocalyptic number.

It is an amenable number.

28770481 is a deficient number, since it is larger than the sum of its proper divisors (268991).

28770481 is a wasteful number, since it uses less digits than its factorization.

28770481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268990.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 28770481 is about 5363.8121704623. The cubic root of 28770481 is about 306.4190117490.

The spelling of 28770481 in words is "twenty-eight million, seven hundred seventy thousand, four hundred eighty-one".