28721999359 has 12 divisors (see below), whose sum is σ = 29814100056. Its totient is φ = 27668627168.

The previous prime is 28721999353. The next prime is 28721999387. The reversal of 28721999359 is 95399912782.

It is not a de Polignac number, because 28721999359 - 2³ = 28721999351 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28721999359.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28721999351) 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, 334017 + ... + 411109.

It is an arithmetic number, because the mean of its divisors is an integer number (2484508338).

Almost surely, 2^28721999359 is an apocalyptic number.

28721999359 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28721999359 is a deficient number, since it is larger than the sum of its proper divisors (1092100697).

28721999359 is an equidigital number, since it uses as much as digits as its factorization.

28721999359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77594 (or 77565 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 64.

The spelling of 28721999359 in words is "twenty-eight billion, seven hundred twenty-one million, nine hundred ninety-nine thousand, three hundred fifty-nine".