428580021 has 8 divisors (see below), whose sum is σ = 572432704. Its totient is φ = 285223680.

The previous prime is 428579989. The next prime is 428580029. The reversal of 428580021 is 120085824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 428580021 - 2⁵ = 428579989 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 (428580029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122065 + ... + 125526.

It is an arithmetic number, because the mean of its divisors is an integer number (71554088).

Almost surely, 2^428580021 is an apocalyptic number.

It is an amenable number.

428580021 is a deficient number, since it is larger than the sum of its proper divisors (143852683).

428580021 is a wasteful number, since it uses less digits than its factorization.

428580021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248171.

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 428580021 is about 20702.1743060964. The cubic root of 428580021 is about 753.9524797262.

The spelling of 428580021 in words is "four hundred twenty-eight million, five hundred eighty thousand, twenty-one".