28717428751 has 16 divisors (see below), whose sum is σ = 32315415840. Its totient is φ = 25290161280.

The previous prime is 28717428749. The next prime is 28717428769. The reversal of 28717428751 is 15782471782.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28717428751 - 2¹ = 28717428749 is a prime.

It is a super-2 number, since 2×28717428751² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717428451) 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, 60856 + ... + 247261.

It is an arithmetic number, because the mean of its divisors is an integer number (2019713490).

Almost surely, 2^28717428751 is an apocalyptic number.

28717428751 is a deficient number, since it is larger than the sum of its proper divisors (3597987089).

28717428751 is a wasteful number, since it uses less digits than its factorization.

28717428751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308394.

The product of its digits is 1756160, while the sum is 52.

The spelling of 28717428751 in words is "twenty-eight billion, seven hundred seventeen million, four hundred twenty-eight thousand, seven hundred fifty-one".