428251813 has 8 divisors (see below), whose sum is σ = 468053856. Its totient is φ = 388594800.

The previous prime is 428251793. The next prime is 428251823. The reversal of 428251813 is 318152824.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-428251813 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 (428251823) 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, 30031 + ... + 41932.

It is an arithmetic number, because the mean of its divisors is an integer number (58506732).

Almost surely, 2^428251813 is an apocalyptic number.

It is an amenable number.

428251813 is a deficient number, since it is larger than the sum of its proper divisors (39802043).

428251813 is a wasteful number, since it uses less digits than its factorization.

428251813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72515.

The product of its digits is 15360, while the sum is 34.

The square root of 428251813 is about 20694.2458910684. The cubic root of 428251813 is about 753.7599708076.

The spelling of 428251813 in words is "four hundred twenty-eight million, two hundred fifty-one thousand, eight hundred thirteen".