428517388493 has 4 divisors (see below), whose sum is σ = 431788513728. Its totient is φ = 425246263260.

The previous prime is 428517388463. The next prime is 428517388501. The reversal of 428517388493 is 394883715824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428517388493 - 2¹⁴ = 428517372109 is a prime.

It is a super-2 number, since 2×428517388493² (a number of 24 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 (428517388463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635562421 + ... + 1635562682.

It is an arithmetic number, because the mean of its divisors is an integer number (107947128432).

Almost surely, 2^428517388493 is an apocalyptic number.

It is an amenable number.

428517388493 is a deficient number, since it is larger than the sum of its proper divisors (3271125235).

428517388493 is a wasteful number, since it uses less digits than its factorization.

428517388493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271125234.

The product of its digits is 46448640, while the sum is 62.

The spelling of 428517388493 in words is "four hundred twenty-eight billion, five hundred seventeen million, three hundred eighty-eight thousand, four hundred ninety-three".