445428 has 18 divisors (see below), whose sum is σ = 1126034. Its totient is φ = 148464.

The previous prime is 445427. The next prime is 445433. The reversal of 445428 is 824544.

It can be written as a sum of positive squares in only one way, i.e., 381924 + 63504 = 618^2 + 252^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×445428² = 396812206368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6151 + ... + 6222.

2⁴⁴⁵⁴²⁸ is an apocalyptic number.

It is an amenable number.

445428 is an abundant number, since it is smaller than the sum of its proper divisors (680606).

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

445428 is a wasteful number, since it uses less digits than its factorization.

445428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12383 (or 12378 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 445428 is about 667.4039256702. The cubic root of 445428 is about 76.3705358639.

It can be divided in two parts, 44 and 5428, that multiplied together give a palindrome (238832).

The spelling of 445428 in words is "four hundred forty-five thousand, four hundred twenty-eight".