4028420591 has 4 divisors (see below), whose sum is σ = 4338299112. Its totient is φ = 3718542072.

The previous prime is 4028420549. The next prime is 4028420633. The reversal of 4028420591 is 1950248204.

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

It is an interprime number because it is at equal distance from previous prime (4028420549) and next prime (4028420633).

It is a cyclic number.

It is not a de Polignac number, because 4028420591 - 2²² = 4024226287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4028420531) 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, 154939241 + ... + 154939266.

It is an arithmetic number, because the mean of its divisors is an integer number (1084574778).

Almost surely, 2^4028420591 is an apocalyptic number.

4028420591 is a deficient number, since it is larger than the sum of its proper divisors (309878521).

4028420591 is a wasteful number, since it uses less digits than its factorization.

4028420591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309878520.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 4028420591 is about 63469.8400108272. The cubic root of 4028420591 is about 1591.1517558468.

Adding to 4028420591 its reverse (1950248204), we get a palindrome (5978668795).

The spelling of 4028420591 in words is "four billion, twenty-eight million, four hundred twenty thousand, five hundred ninety-one".