28454331 has 4 divisors (see below), whose sum is σ = 37939112. Its totient is φ = 18969552.

The previous prime is 28454281. The next prime is 28454351. The reversal of 28454331 is 13345482.

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

It is not a de Polignac number, because 28454331 - 2¹⁹ = 27930043 is a prime.

It is a super-2 number, since 2×28454331² = 1619297905315122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28454351) 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, 4742386 + ... + 4742391.

It is an arithmetic number, because the mean of its divisors is an integer number (9484778).

Almost surely, 2^28454331 is an apocalyptic number.

28454331 is a deficient number, since it is larger than the sum of its proper divisors (9484781).

28454331 is an equidigital number, since it uses as much as digits as its factorization.

28454331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9484780.

The product of its digits is 11520, while the sum is 30.

The square root of 28454331 is about 5334.2601173921. The cubic root of 28454331 is about 305.2924937538.

It can be divided in two parts, 284 and 54331, that added together give a triangular number (54615 = T₃₃₀).

The spelling of 28454331 in words is "twenty-eight million, four hundred fifty-four thousand, three hundred thirty-one".