442778794428 has 48 divisors (see below), whose sum is σ = 1081093819680. Its totient is φ = 140894417664.

The previous prime is 442778794399. The next prime is 442778794433. The reversal of 442778794428 is 824497877244.

It is a super-2 number, since 2×442778794428² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9384483 + ... + 9431546.

It is an arithmetic number, because the mean of its divisors is an integer number (22522787910).

Almost surely, 2^442778794428 is an apocalyptic number.

It is an amenable number.

442778794428 is an abundant number, since it is smaller than the sum of its proper divisors (638315025252).

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

442778794428 is a wasteful number, since it uses less digits than its factorization.

442778794428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18816126 (or 18816124 counting only the distinct ones).

The product of its digits is 202309632, while the sum is 66.

The spelling of 442778794428 in words is "four hundred forty-two billion, seven hundred seventy-eight million, seven hundred ninety-four thousand, four hundred twenty-eight".