28363430781 has 12 divisors (see below), whose sum is σ = 46822171552. Its totient is φ = 16207674696.

The previous prime is 28363430759. The next prime is 28363430783. The reversal of 28363430781 is 18703436382.

28363430781 is a `hidden beast` number, since 2 + 8 + 3 + 634 + 3 + 0 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 28363430781 - 2¹¹ = 28363428733 is a prime.

It is a super-2 number, since 2×28363430781² (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 (28363430783) 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, 225106531 + ... + 225106656.

Almost surely, 2^28363430781 is an apocalyptic number.

28363430781 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28363430781 is a deficient number, since it is larger than the sum of its proper divisors (18458740771).

28363430781 is a wasteful number, since it uses less digits than its factorization.

28363430781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450213200 (or 450213197 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 28363430781 in words is "twenty-eight billion, three hundred sixty-three million, four hundred thirty thousand, seven hundred eighty-one".