28741521 has 8 divisors (see below), whose sum is σ = 38376064. Its totient is φ = 19134000.

The previous prime is 28741511. The next prime is 28741541. The reversal of 28741521 is 12514782.

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

It is not a de Polignac number, because 28741521 - 2¹⁰ = 28740497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28741511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4126 + ... + 8631.

It is an arithmetic number, because the mean of its divisors is an integer number (4797008).

Almost surely, 2^28741521 is an apocalyptic number.

It is an amenable number.

28741521 is a deficient number, since it is larger than the sum of its proper divisors (9634543).

28741521 is a wasteful number, since it uses less digits than its factorization.

28741521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13511.

The product of its digits is 4480, while the sum is 30.

The square root of 28741521 is about 5361.1119182498. Note that the first 3 decimals coincide. The cubic root of 28741521 is about 306.3161647407.

The spelling of 28741521 in words is "twenty-eight million, seven hundred forty-one thousand, five hundred twenty-one".