28939851506 has 16 divisors (see below), whose sum is σ = 45521832600. Its totient is φ = 13779577728.

The previous prime is 28939851503. The next prime is 28939851527. The reversal of 28939851506 is 60515893982.

It can be written as a sum of positive squares in 4 ways, for example, as 22934376481 + 6005475025 = 151441^2 + 77495^2 .

It is not an unprimeable number, because it can be changed into a prime (28939851503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3413321 + ... + 3421788.

Almost surely, 2^28939851506 is an apocalyptic number.

28939851506 is a deficient number, since it is larger than the sum of its proper divisors (16581981094).

28939851506 is a wasteful number, since it uses less digits than its factorization.

28939851506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6835213.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 28939851506 in words is "twenty-eight billion, nine hundred thirty-nine million, eight hundred fifty-one thousand, five hundred six".