428638089 has 8 divisors (see below), whose sum is σ = 623473632. Its totient is φ = 259780640.

The previous prime is 428638079. The next prime is 428638099. The reversal of 428638089 is 980836824.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (428638079) and next prime (428638099).

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

It is a cyclic number.

It is not a de Polignac number, because 428638089 - 2⁵ = 428638057 is a prime.

It is a super-2 number, since 2×428638089² = 367461222683143842, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (428638019) 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, 6494484 + ... + 6494549.

It is an arithmetic number, because the mean of its divisors is an integer number (77934204).

Almost surely, 2^428638089 is an apocalyptic number.

It is an amenable number.

428638089 is a deficient number, since it is larger than the sum of its proper divisors (194835543).

428638089 is a wasteful number, since it uses less digits than its factorization.

428638089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12989047.

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 428638089 is about 20703.5767199776. The cubic root of 428638089 is about 753.9865290156.

The spelling of 428638089 in words is "four hundred twenty-eight million, six hundred thirty-eight thousand, eighty-nine".