428557 has 2 divisors, whose sum is σ = 428558. Its totient is φ = 428556.

The previous prime is 428551. The next prime is 428563. The reversal of 428557 is 755824.

It is a balanced prime because it is at equal distance from previous prime (428551) and next prime (428563).

It can be written as a sum of positive squares in only one way, i.e., 427716 + 841 = 654^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 428557 - 2⁷ = 428429 is a prime.

It is a super-2 number, since 2×428557² = 367322204498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214278 + 214279.

It is an arithmetic number, because the mean of its divisors is an integer number (214279).

2⁴²⁸⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

428557 is a deficient number, since it is larger than the sum of its proper divisors (1).

428557 is an equidigital number, since it uses as much as digits as its factorization.

428557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11200, while the sum is 31.

The square root of 428557 is about 654.6426506118. The cubic root of 428557 is about 75.3938980068.

It can be divided in two parts, 4 and 28557, that added together give a 4-th power (28561 = 13⁴).

The spelling of 428557 in words is "four hundred twenty-eight thousand, five hundred fifty-seven".