28181628741 has 32 divisors (see below), whose sum is σ = 43315734528. Its totient is φ = 15964764480.

The previous prime is 28181628737. The next prime is 28181628763. The reversal of 28181628741 is 14782618182.

It is not a de Polignac number, because 28181628741 - 2² = 28181628737 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28181628701) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1158736 + ... + 1182806.

It is an arithmetic number, because the mean of its divisors is an integer number (1353616704).

Almost surely, 2^28181628741 is an apocalyptic number.

28181628741 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28181628741 is a deficient number, since it is larger than the sum of its proper divisors (15134105787).

28181628741 is a wasteful number, since it uses less digits than its factorization.

28181628741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24561.

The product of its digits is 344064, while the sum is 48.

The spelling of 28181628741 in words is "twenty-eight billion, one hundred eighty-one million, six hundred twenty-eight thousand, seven hundred forty-one".