28461813 has 8 divisors (see below), whose sum is σ = 39173376. Its totient is φ = 18362400.

The previous prime is 28461803. The next prime is 28461821. The reversal of 28461813 is 31816482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28461813 - 2¹² = 28457717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28461803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152928 + ... + 153113.

It is an arithmetic number, because the mean of its divisors is an integer number (4896672).

Almost surely, 2^28461813 is an apocalyptic number.

It is an amenable number.

28461813 is a deficient number, since it is larger than the sum of its proper divisors (10711563).

28461813 is a wasteful number, since it uses less digits than its factorization.

28461813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306075.

The product of its digits is 9216, while the sum is 33.

The square root of 28461813 is about 5334.9613869268. The cubic root of 28461813 is about 305.3192500586.

The spelling of 28461813 in words is "twenty-eight million, four hundred sixty-one thousand, eight hundred thirteen".