28390026623 has 4 divisors (see below), whose sum is σ = 32445744720. Its totient is φ = 24334308528.

The previous prime is 28390026619. The next prime is 28390026631. The reversal of 28390026623 is 32662009382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32662009382 = 2 ⋅16331004691.

It is a cyclic number.

It is not a de Polignac number, because 28390026623 - 2² = 28390026619 is a prime.

It is a super-2 number, since 2×28390026623² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390026523) 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, 2027859038 + ... + 2027859051.

It is an arithmetic number, because the mean of its divisors is an integer number (8111436180).

Almost surely, 2^28390026623 is an apocalyptic number.

28390026623 is a deficient number, since it is larger than the sum of its proper divisors (4055718097).

28390026623 is an equidigital number, since it uses as much as digits as its factorization.

28390026623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055718096.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 28390026623 in words is "twenty-eight billion, three hundred ninety million, twenty-six thousand, six hundred twenty-three".