28651481 has 4 divisors (see below), whose sum is σ = 28664832. Its totient is φ = 28638132.

The previous prime is 28651457. The next prime is 28651531. The reversal of 28651481 is 18415682.

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: 18415682 = 2 ⋅9207841.

It is a cyclic number.

It is not a de Polignac number, because 28651481 - 2²² = 24457177 is a prime.

It is a super-2 number, since 2×28651481² = 1641814726986722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28651421) 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, 2645 + ... + 8018.

It is an arithmetic number, because the mean of its divisors is an integer number (7166208).

Almost surely, 2^28651481 is an apocalyptic number.

It is an amenable number.

28651481 is a deficient number, since it is larger than the sum of its proper divisors (13351).

28651481 is a wasteful number, since it uses less digits than its factorization.

28651481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13350.

The product of its digits is 15360, while the sum is 35.

The square root of 28651481 is about 5352.7078194125. The cubic root of 28651481 is about 305.9959594779.

The spelling of 28651481 in words is "twenty-eight million, six hundred fifty-one thousand, four hundred eighty-one".