428193081 has 16 divisors (see below), whose sum is σ = 637654720. Its totient is φ = 283979520.

The previous prime is 428193079. The next prime is 428193109. The reversal of 428193081 is 180391824.

It is not a de Polignac number, because 428193081 - 2¹ = 428193079 is a prime.

It is a super-2 number, since 2×428193081² = 366698629232545122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428198081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35875 + ... + 46296.

It is an arithmetic number, because the mean of its divisors is an integer number (39853420).

Almost surely, 2^428193081 is an apocalyptic number.

It is an amenable number.

428193081 is a deficient number, since it is larger than the sum of its proper divisors (209461639).

428193081 is a wasteful number, since it uses less digits than its factorization.

428193081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82373 (or 82367 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 428193081 is about 20692.8268006089. The cubic root of 428193081 is about 753.7255114442.

The spelling of 428193081 in words is "four hundred twenty-eight million, one hundred ninety-three thousand, eighty-one".