428320033508491 has 8 divisors (see below), whose sum is σ = 443099582237520. Its totient is φ = 413541144272928.

The previous prime is 428320033508459. The next prime is 428320033508527. The reversal of 428320033508491 is 194805330023824.

It is a happy number.

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 428320033508491 - 2⁵ = 428320033508459 is a prime.

It is a super-2 number, since 2×428320033508491² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428320033508431) 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, 163551841 + ... + 166150066.

It is an arithmetic number, because the mean of its divisors is an integer number (55387447779690).

Almost surely, 2^{428320033508491} is an apocalyptic number.

428320033508491 is a deficient number, since it is larger than the sum of its proper divisors (14779548729029).

428320033508491 is a wasteful number, since it uses less digits than its factorization.

428320033508491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329746733.

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 428320033508491 in words is "four hundred twenty-eight trillion, three hundred twenty billion, thirty-three million, five hundred eight thousand, four hundred ninety-one".