28461811 has 4 divisors (see below), whose sum is σ = 32527792. Its totient is φ = 24395832.

The previous prime is 28461803. The next prime is 28461821. The reversal of 28461811 is 11816482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11816482 = 2 ⋅5908241.

It is a cyclic number.

It is not a de Polignac number, because 28461811 - 2³ = 28461803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28461821) 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, 2032980 + ... + 2032993.

It is an arithmetic number, because the mean of its divisors is an integer number (8131948).

Almost surely, 2^28461811 is an apocalyptic number.

28461811 is a deficient number, since it is larger than the sum of its proper divisors (4065981).

28461811 is an equidigital number, since it uses as much as digits as its factorization.

28461811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4065980.

The product of its digits is 3072, while the sum is 31.

The square root of 28461811 is about 5334.9611994840. The cubic root of 28461811 is about 305.3192429071.

The spelling of 28461811 in words is "twenty-eight million, four hundred sixty-one thousand, eight hundred eleven".