28712390456493 has 20 divisors (see below), whose sum is σ = 43218763598208. Its totient is φ = 18995474595240.

The previous prime is 28712390456441. The next prime is 28712390456507. The reversal of 28712390456493 is 39465409321782.

28712390456493 is a `hidden beast` number, since 2 + 8 + 7 + 1 + 2 + 3 + 90 + 4 + 56 + 493 = 666.

It is not a de Polignac number, because 28712390456493 - 2⁶ = 28712390456429 is a prime.

It is a super-2 number, since 2×28712390456493² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28712390456493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28712390456423) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1352943421 + ... + 1352964642.

It is a 1-persistent number, because it is pandigital, but 2⋅28712390456493 = 57424780912986 is not.

Almost surely, 2^{28712390456493} is an apocalyptic number.

It is an amenable number.

28712390456493 is a deficient number, since it is larger than the sum of its proper divisors (14506373141715).

28712390456493 is a wasteful number, since it uses less digits than its factorization.

28712390456493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705908206 (or 2705908197 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 63.

The spelling of 28712390456493 in words is "twenty-eight trillion, seven hundred twelve billion, three hundred ninety million, four hundred fifty-six thousand, four hundred ninety-three".