28115461 has 4 divisors (see below), whose sum is σ = 30671424. Its totient is φ = 25559500.

The previous prime is 28115443. The next prime is 28115473. The reversal of 28115461 is 16451182.

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.

It is a cyclic number.

It is not a de Polignac number, because 28115461 - 2⁵ = 28115429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28115491) 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, 1277965 + ... + 1277986.

It is an arithmetic number, because the mean of its divisors is an integer number (7667856).

Almost surely, 2^28115461 is an apocalyptic number.

It is an amenable number.

28115461 is a deficient number, since it is larger than the sum of its proper divisors (2555963).

28115461 is a wasteful number, since it uses less digits than its factorization.

28115461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555962.

The product of its digits is 1920, while the sum is 28.

The square root of 28115461 is about 5302.4014370849. The cubic root of 28115461 is about 304.0757147800.

The spelling of 28115461 in words is "twenty-eight million, one hundred fifteen thousand, four hundred sixty-one".