28058018781 has 128 divisors (see below), whose sum is σ = 45897062400. Its totient is φ = 15075164160.

The previous prime is 28058018753. The next prime is 28058018783. The reversal of 28058018781 is 18781085082.

It is not a de Polignac number, because 28058018781 - 2²¹ = 28055921629 is a prime.

It is a super-2 number, since 2×28058018781² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28058018781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28058018783) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 55123555 + ... + 55124063.

It is an arithmetic number, because the mean of its divisors is an integer number (358570800).

Almost surely, 2^28058018781 is an apocalyptic number.

It is an amenable number.

28058018781 is a deficient number, since it is larger than the sum of its proper divisors (17839043619).

28058018781 is a wasteful number, since it uses less digits than its factorization.

28058018781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 286720, while the sum is 48.

The spelling of 28058018781 in words is "twenty-eight billion, fifty-eight million, eighteen thousand, seven hundred eighty-one".