28809956931 has 8 divisors (see below), whose sum is σ = 43900886784. Its totient is φ = 16462832520.

The previous prime is 28809956891. The next prime is 28809956953. The reversal of 28809956931 is 13965990882.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28809956931 - 2¹⁴ = 28809940547 is a prime.

It is a super-2 number, since 2×28809956931² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28809956431) 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 7 ways as a sum of consecutive naturals, for example, 685951335 + ... + 685951376.

It is an arithmetic number, because the mean of its divisors is an integer number (5487610848).

Almost surely, 2^28809956931 is an apocalyptic number.

28809956931 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28809956931 is a deficient number, since it is larger than the sum of its proper divisors (15090929853).

28809956931 is a wasteful number, since it uses less digits than its factorization.

28809956931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371902721.

The product of its (nonzero) digits is 8398080, while the sum is 60.

The spelling of 28809956931 in words is "twenty-eight billion, eight hundred nine million, nine hundred fifty-six thousand, nine hundred thirty-one".