28711451 has 4 divisors (see below), whose sum is σ = 30222600. Its totient is φ = 27200304.

The previous prime is 28711433. The next prime is 28711469. The reversal of 28711451 is 15411782.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28711433) and next prime (28711469).

It is a cyclic number.

It is not a de Polignac number, because 28711451 - 2⁶ = 28711387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28711471) 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 3 ways as a sum of consecutive naturals, for example, 755546 + ... + 755583.

It is an arithmetic number, because the mean of its divisors is an integer number (7555650).

Almost surely, 2^28711451 is an apocalyptic number.

28711451 is a deficient number, since it is larger than the sum of its proper divisors (1511149).

28711451 is a wasteful number, since it uses less digits than its factorization.

28711451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511148.

The product of its digits is 2240, while the sum is 29.

The square root of 28711451 is about 5358.3067288090. The cubic root of 28711451 is about 306.2093026025.

The spelling of 28711451 in words is "twenty-eight million, seven hundred eleven thousand, four hundred fifty-one".