428733875250891 has 24 divisors (see below), whose sum is σ = 707761985679840. Its totient is φ = 244987038210816.

The previous prime is 428733875250839. The next prime is 428733875250971. The reversal of 428733875250891 is 198052578337824.

It is a happy number.

428733875250891 is a `hidden beast` number, since 4 + 2 + 8 + 7 + 3 + 3 + 8 + 7 + 525 + 0 + 8 + 91 = 666.

It is not a de Polignac number, because 428733875250891 - 2²⁹ = 428733338379979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428733875150891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47896926 + ... + 56138963.

It is an arithmetic number, because the mean of its divisors is an integer number (29490082736660).

Almost surely, 2^{428733875250891} is an apocalyptic number.

428733875250891 is a deficient number, since it is larger than the sum of its proper divisors (279028110428949).

428733875250891 is a wasteful number, since it uses less digits than its factorization.

428733875250891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104101315 (or 104101312 counting only the distinct ones).

The product of its (nonzero) digits is 812851200, while the sum is 72.

The spelling of 428733875250891 in words is "four hundred twenty-eight trillion, seven hundred thirty-three billion, eight hundred seventy-five million, two hundred fifty thousand, eight hundred ninety-one".