428080091 has 4 divisors (see below), whose sum is σ = 428358000. Its totient is φ = 427802184.

The previous prime is 428080039. The next prime is 428080181. The reversal of 428080091 is 190080824.

It is a happy number.

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 428080091 - 2¹⁴ = 428063707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428080291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136631 + ... + 139728.

It is an arithmetic number, because the mean of its divisors is an integer number (107089500).

Almost surely, 2^428080091 is an apocalyptic number.

428080091 is a deficient number, since it is larger than the sum of its proper divisors (277909).

428080091 is a wasteful number, since it uses less digits than its factorization.

428080091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277908.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 428080091 is about 20690.0964473344. The cubic root of 428080091 is about 753.6592088490.

The spelling of 428080091 in words is "four hundred twenty-eight million, eighty thousand, ninety-one".