28623619 has 4 divisors (see below), whose sum is σ = 28646640. Its totient is φ = 28600600.

The previous prime is 28623601. The next prime is 28623643. The reversal of 28623619 is 91632682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91632682 = 2 ⋅45816341.

It is a cyclic number.

It is not a de Polignac number, because 28623619 - 2⁵ = 28623587 is a prime.

It is a super-2 number, since 2×28623619² = 1638623129314322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28623919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9532 + ... + 12169.

It is an arithmetic number, because the mean of its divisors is an integer number (7161660).

Almost surely, 2^28623619 is an apocalyptic number.

28623619 is a deficient number, since it is larger than the sum of its proper divisors (23021).

28623619 is a wasteful number, since it uses less digits than its factorization.

28623619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23020.

The product of its digits is 31104, while the sum is 37.

The square root of 28623619 is about 5350.1045784171. The cubic root of 28623619 is about 305.8967391910.

The spelling of 28623619 in words is "twenty-eight million, six hundred twenty-three thousand, six hundred nineteen".