428660 has 12 divisors (see below), whose sum is σ = 900228. Its totient is φ = 171456.

The previous prime is 428657. The next prime is 428663. The reversal of 428660 is 66824.

428660 = T₃₇₅ + T₃₇₆ + ... + T₃₈₀.

It is an interprime number because it is at equal distance from previous prime (428657) and next prime (428663).

It can be written as a sum of positive squares in 2 ways, for example, as 85264 + 343396 = 292^2 + 586^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428663) 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, 10697 + ... + 10736.

It is an arithmetic number, because the mean of its divisors is an integer number (75019).

2⁴²⁸⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

428660 is an abundant number, since it is smaller than the sum of its proper divisors (471568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

428660 is a wasteful number, since it uses less digits than its factorization.

428660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21442 (or 21440 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 428660 is about 654.7213147592. The cubic root of 428660 is about 75.3999376153.

The spelling of 428660 in words is "four hundred twenty-eight thousand, six hundred sixty".