28319621716 has 6 divisors (see below), whose sum is σ = 49559338010. Its totient is φ = 14159810856.

The previous prime is 28319621713. The next prime is 28319621719. The reversal of 28319621716 is 61712691382.

It is an interprime number because it is at equal distance from previous prime (28319621713) and next prime (28319621719).

It can be written as a sum of positive squares in only one way, i.e., 19864083600 + 8455538116 = 140940^2 + 91954^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28319621713) 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 as a sum of consecutive naturals, namely, 3539952711 + ... + 3539952718.

Almost surely, 2^28319621716 is an apocalyptic number.

It is an amenable number.

28319621716 is a deficient number, since it is larger than the sum of its proper divisors (21239716294).

28319621716 is a wasteful number, since it uses less digits than its factorization.

28319621716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7079905433 (or 7079905431 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The spelling of 28319621716 in words is "twenty-eight billion, three hundred nineteen million, six hundred twenty-one thousand, seven hundred sixteen".