28815901261 has 8 divisors (see below), whose sum is σ = 32949353984. Its totient is φ = 24686672400.

The previous prime is 28815901237. The next prime is 28815901267. The reversal of 28815901261 is 16210951882.

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 28815901261 - 2⁷ = 28815901133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28815901267) by changing a digit.

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, 1041330 + ... + 1068643.

It is an arithmetic number, because the mean of its divisors is an integer number (4118669248).

Almost surely, 2^28815901261 is an apocalyptic number.

It is an amenable number.

28815901261 is a deficient number, since it is larger than the sum of its proper divisors (4133452723).

28815901261 is a wasteful number, since it uses less digits than its factorization.

28815901261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111931.

The product of its (nonzero) digits is 69120, while the sum is 43.

The spelling of 28815901261 in words is "twenty-eight billion, eight hundred fifteen million, nine hundred one thousand, two hundred sixty-one".