428148581 has 4 divisors (see below), whose sum is σ = 489312672. Its totient is φ = 366984492.

The previous prime is 428148557. The next prime is 428148583. The reversal of 428148581 is 185841824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 428148581 - 2⁶ = 428148517 is a prime.

It is a super-2 number, since 2×428148581² = 366622414824627122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428148583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30582035 + ... + 30582048.

It is an arithmetic number, because the mean of its divisors is an integer number (122328168).

Almost surely, 2^428148581 is an apocalyptic number.

It is an amenable number.

428148581 is a deficient number, since it is larger than the sum of its proper divisors (61164091).

428148581 is an equidigital number, since it uses as much as digits as its factorization.

428148581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61164090.

The product of its digits is 81920, while the sum is 41.

The square root of 428148581 is about 20691.7515208355. The cubic root of 428148581 is about 753.6994002117.

The spelling of 428148581 in words is "four hundred twenty-eight million, one hundred forty-eight thousand, five hundred eighty-one".