428557493 has 8 divisors (see below), whose sum is σ = 527455488. Its totient is φ = 339078384.

The previous prime is 428557489. The next prime is 428557511. The reversal of 428557493 is 394755824.

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 428557493 - 2² = 428557489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428557453) 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, 2354621 + ... + 2354802.

It is an arithmetic number, because the mean of its divisors is an integer number (65931936).

Almost surely, 2^428557493 is an apocalyptic number.

It is an amenable number.

428557493 is a deficient number, since it is larger than the sum of its proper divisors (98897995).

428557493 is a wasteful number, since it uses less digits than its factorization.

428557493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709443.

The product of its digits is 1209600, while the sum is 47.

The square root of 428557493 is about 20701.6302015083. The cubic root of 428557493 is about 753.9392691718.

The spelling of 428557493 in words is "four hundred twenty-eight million, five hundred fifty-seven thousand, four hundred ninety-three".