28721516675 has 12 divisors (see below), whose sum is σ = 35637228000. Its totient is φ = 22962666720.

The previous prime is 28721516633. The next prime is 28721516699. The reversal of 28721516675 is 57661512782.

It is not a de Polignac number, because 28721516675 - 2⁸ = 28721516419 is a prime.

It is a super-2 number, since 2×28721516675² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 323300 + ... + 402449.

It is an arithmetic number, because the mean of its divisors is an integer number (2969769000).

Almost surely, 2^28721516675 is an apocalyptic number.

28721516675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28721516675 is a deficient number, since it is larger than the sum of its proper divisors (6915711325).

28721516675 is a wasteful number, since it uses less digits than its factorization.

28721516675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727342 (or 727337 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 50.

The spelling of 28721516675 in words is "twenty-eight billion, seven hundred twenty-one million, five hundred sixteen thousand, six hundred seventy-five".