428611493 has 4 divisors (see below), whose sum is σ = 430279500. Its totient is φ = 426943488.

The previous prime is 428611489. The next prime is 428611501. The reversal of 428611493 is 394116824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 275792449 + 152819044 = 16607^2 + 12362^2 .

It is a cyclic number.

It is not a de Polignac number, because 428611493 - 2² = 428611489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428611423) 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, 833618 + ... + 834131.

It is an arithmetic number, because the mean of its divisors is an integer number (107569875).

Almost surely, 2^428611493 is an apocalyptic number.

It is an amenable number.

428611493 is a deficient number, since it is larger than the sum of its proper divisors (1668007).

428611493 is a wasteful number, since it uses less digits than its factorization.

428611493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668006.

The product of its digits is 41472, while the sum is 38.

The square root of 428611493 is about 20702.9344055378. The cubic root of 428611493 is about 753.9709343208.

The spelling of 428611493 in words is "four hundred twenty-eight million, six hundred eleven thousand, four hundred ninety-three".