28713306981 has 16 divisors (see below), whose sum is σ = 38451544128. Its totient is φ = 19058793600.

The previous prime is 28713306961. The next prime is 28713306983. The reversal of 28713306981 is 18960331782.

It is not a de Polignac number, because 28713306981 - 2²³ = 28704918373 is a prime.

It is a super-2 number, since 2×28713306981² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28713306981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28713306983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736675 + ... + 774671.

It is an arithmetic number, because the mean of its divisors is an integer number (2403221508).

Almost surely, 2^28713306981 is an apocalyptic number.

It is an amenable number.

28713306981 is a deficient number, since it is larger than the sum of its proper divisors (9738237147).

28713306981 is a wasteful number, since it uses less digits than its factorization.

28713306981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39092.

The product of its (nonzero) digits is 435456, while the sum is 48.

The spelling of 28713306981 in words is "twenty-eight billion, seven hundred thirteen million, three hundred six thousand, nine hundred eighty-one".