28015291801 has 12 divisors (see below), whose sum is σ = 32619095652. Its totient is φ = 23991091488.

The previous prime is 28015291771. The next prime is 28015291807. The reversal of 28015291801 is 10819251082.

It can be written as a sum of positive squares in 2 ways, for example, as 27106329600 + 908962201 = 164640^2 + 30149^2 .

It is not a de Polignac number, because 28015291801 - 2⁵ = 28015291769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28015291807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207990 + ... + 315103.

It is an arithmetic number, because the mean of its divisors is an integer number (2718257971).

Almost surely, 2^28015291801 is an apocalyptic number.

It is an amenable number.

28015291801 is a deficient number, since it is larger than the sum of its proper divisors (4603803851).

28015291801 is a wasteful number, since it uses less digits than its factorization.

28015291801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524200 (or 524193 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 37.

It can be divided in two parts, 280152 and 91801, that added together give a triangular number (371953 = T₈₆₂).

The spelling of 28015291801 in words is "twenty-eight billion, fifteen million, two hundred ninety-one thousand, eight hundred one".