428565251 has 8 divisors (see below), whose sum is σ = 439783344. Its totient is φ = 417383680.

The previous prime is 428565209. The next prime is 428565329. The reversal of 428565251 is 152565824.

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 428565251 - 2¹⁸ = 428303107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428561251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15500 + ... + 33126.

It is an arithmetic number, because the mean of its divisors is an integer number (54972918).

Almost surely, 2^428565251 is an apocalyptic number.

428565251 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

428565251 is a deficient number, since it is larger than the sum of its proper divisors (11218093).

428565251 is a wasteful number, since it uses less digits than its factorization.

428565251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18261.

The product of its digits is 96000, while the sum is 38.

The square root of 428565251 is about 20701.8175772080. The cubic root of 428565251 is about 753.9438185618.

The spelling of 428565251 in words is "four hundred twenty-eight million, five hundred sixty-five thousand, two hundred fifty-one".