428833091 has 4 divisors (see below), whose sum is σ = 447478032. Its totient is φ = 410188152.

The previous prime is 428833087. The next prime is 428833127. The reversal of 428833091 is 190338824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428833091 - 2² = 428833087 is a prime.

It is a super-2 number, since 2×428833091² = 367795639873228562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428833001) 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, 9322436 + ... + 9322481.

It is an arithmetic number, because the mean of its divisors is an integer number (111869508).

Almost surely, 2^428833091 is an apocalyptic number.

428833091 is a deficient number, since it is larger than the sum of its proper divisors (18644941).

428833091 is a wasteful number, since it uses less digits than its factorization.

428833091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18644940.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 428833091 is about 20708.2855639959. The cubic root of 428833091 is about 754.1008496934.

The spelling of 428833091 in words is "four hundred twenty-eight million, eight hundred thirty-three thousand, ninety-one".