28491709766 has 32 divisors (see below), whose sum is σ = 46776858240. Its totient is φ = 12936433536.

The previous prime is 28491709699. The next prime is 28491709801. The reversal of 28491709766 is 66790719482.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 543920 + ... + 593996.

It is an arithmetic number, because the mean of its divisors is an integer number (1461776820).

Almost surely, 2^28491709766 is an apocalyptic number.

28491709766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28491709766 is a deficient number, since it is larger than the sum of its proper divisors (18285148474).

28491709766 is a wasteful number, since it uses less digits than its factorization.

28491709766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50448.

The product of its (nonzero) digits is 9144576, while the sum is 59.

The spelling of 28491709766 in words is "twenty-eight billion, four hundred ninety-one million, seven hundred nine thousand, seven hundred sixty-six".