428726551891 has 8 divisors (see below), whose sum is σ = 467913636864. Its totient is φ = 389574790920.

The previous prime is 428726551889. The next prime is 428726551927. The reversal of 428726551891 is 198155627824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 428726551891 - 2¹ = 428726551889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428726551831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8805615 + ... + 8854168.

It is an arithmetic number, because the mean of its divisors is an integer number (58489204608).

Almost surely, 2^428726551891 is an apocalyptic number.

428726551891 is a deficient number, since it is larger than the sum of its proper divisors (39187084973).

428726551891 is a wasteful number, since it uses less digits than its factorization.

428726551891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17662001.

The product of its digits is 9676800, while the sum is 58.

The spelling of 428726551891 in words is "four hundred twenty-eight billion, seven hundred twenty-six million, five hundred fifty-one thousand, eight hundred ninety-one".