428549071 has 4 divisors (see below), whose sum is σ = 429372144. Its totient is φ = 427726000.

The previous prime is 428549029. The next prime is 428549111. The reversal of 428549071 is 170945824.

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 428549071 - 2¹⁹ = 428024783 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 (428549021) 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, 410755 + ... + 411796.

It is an arithmetic number, because the mean of its divisors is an integer number (107343036).

Almost surely, 2^428549071 is an apocalyptic number.

428549071 is a deficient number, since it is larger than the sum of its proper divisors (823073).

428549071 is an equidigital number, since it uses as much as digits as its factorization.

428549071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823072.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 428549071 is about 20701.4267865768. The cubic root of 428549071 is about 753.9343303416.

The spelling of 428549071 in words is "four hundred twenty-eight million, five hundred forty-nine thousand, seventy-one".