28990644545 has 8 divisors (see below), whose sum is σ = 35002202496. Its totient is φ = 23050229616.

The previous prime is 28990644539. The next prime is 28990644647. The reversal of 28990644545 is 54544609982.

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 28990644545 - 2³⁰ = 27916902721 is a prime.

It is a super-2 number, since 2×28990644545² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17784857 + ... + 17786486.

It is an arithmetic number, because the mean of its divisors is an integer number (4375275312).

Almost surely, 2^28990644545 is an apocalyptic number.

It is an amenable number.

28990644545 is a deficient number, since it is larger than the sum of its proper divisors (6011557951).

28990644545 is a wasteful number, since it uses less digits than its factorization.

28990644545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35571511.

The product of its (nonzero) digits is 12441600, while the sum is 56.

The spelling of 28990644545 in words is "twenty-eight billion, nine hundred ninety million, six hundred forty-four thousand, five hundred forty-five".