1428688 has 10 divisors (see below), whose sum is σ = 2768114. Its totient is φ = 714336.

The previous prime is 1428677. The next prime is 1428689. The reversal of 1428688 is 8868241.

It can be written as a sum of positive squares in only one way, i.e., 898704 + 529984 = 948^2 + 728^2 .

It is a super-2 number, since 2×1428688² = 4082298802688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44631 + ... + 44662.

2^1428688 is an apocalyptic number.

It is an amenable number.

1428688 is a deficient number, since it is larger than the sum of its proper divisors (1339426).

1428688 is an equidigital number, since it uses as much as digits as its factorization.

1428688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89301 (or 89295 counting only the distinct ones).

The product of its digits is 24576, while the sum is 37.

The square root of 1428688 is about 1195.2773736669. The cubic root of 1428688 is about 112.6278513553.

It can be divided in two parts, 1428 and 688, that added together give a square (2116 = 46²).

The spelling of 1428688 in words is "one million, four hundred twenty-eight thousand, six hundred eighty-eight".