28719057445 has 8 divisors (see below), whose sum is σ = 37113858936. Its totient is φ = 21207919296.

The previous prime is 28719057439. The next prime is 28719057469. The reversal of 28719057445 is 54475091782.

It can be written as a sum of positive squares in 4 ways, for example, as 809345601 + 27909711844 = 28449^2 + 167062^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28719057445 - 2⁵ = 28719057413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28719057392 and 28719057401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220915762 + ... + 220915891.

It is an arithmetic number, because the mean of its divisors is an integer number (4639232367).

Almost surely, 2^28719057445 is an apocalyptic number.

It is an amenable number.

28719057445 is a deficient number, since it is larger than the sum of its proper divisors (8394801491).

28719057445 is a wasteful number, since it uses less digits than its factorization.

28719057445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441831671.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 28719057445 in words is "twenty-eight billion, seven hundred nineteen million, fifty-seven thousand, four hundred forty-five".