28726447933 has 4 divisors (see below), whose sum is σ = 28862592448. Its totient is φ = 28590303420.

The previous prime is 28726447877. The next prime is 28726447949. The reversal of 28726447933 is 33974462782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28726447933 - 2²⁵ = 28692893501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28726447973) 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, 68071941 + ... + 68072362.

It is an arithmetic number, because the mean of its divisors is an integer number (7215648112).

Almost surely, 2^28726447933 is an apocalyptic number.

It is an amenable number.

28726447933 is a deficient number, since it is larger than the sum of its proper divisors (136144515).

28726447933 is a wasteful number, since it uses less digits than its factorization.

28726447933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136144514.

The product of its digits is 12192768, while the sum is 55.

The spelling of 28726447933 in words is "twenty-eight billion, seven hundred twenty-six million, four hundred forty-seven thousand, nine hundred thirty-three".