428056257 has 4 divisors (see below), whose sum is σ = 570741680. Its totient is φ = 285370836.

The previous prime is 428056253. The next prime is 428056273. The reversal of 428056257 is 752650824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 428056257 - 2² = 428056253 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428056253) 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, 71342707 + ... + 71342712.

It is an arithmetic number, because the mean of its divisors is an integer number (142685420).

Almost surely, 2^428056257 is an apocalyptic number.

It is an amenable number.

428056257 is a deficient number, since it is larger than the sum of its proper divisors (142685423).

428056257 is a wasteful number, since it uses less digits than its factorization.

428056257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142685422.

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 428056257 is about 20689.5204632684. The cubic root of 428056257 is about 753.6452215545.

The spelling of 428056257 in words is "four hundred twenty-eight million, fifty-six thousand, two hundred fifty-seven".