442778628 has 12 divisors (see below), whose sum is σ = 1033150160. Its totient is φ = 147592872.

The previous prime is 442778621. The next prime is 442778629. The reversal of 442778628 is 826877244.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (442778621) 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, 18449098 + ... + 18449121.

Almost surely, 2^442778628 is an apocalyptic number.

It is an amenable number.

442778628 is an abundant number, since it is smaller than the sum of its proper divisors (590371532).

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

442778628 is a wasteful number, since it uses less digits than its factorization.

442778628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36898226 (or 36898224 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 48.

The square root of 442778628 is about 21042.3056721453. The cubic root of 442778628 is about 762.1881927832.

The spelling of 442778628 in words is "four hundred forty-two million, seven hundred seventy-eight thousand, six hundred twenty-eight".