2178026628 has 24 divisors (see below), whose sum is σ = 5089331520. Its totient is φ = 724970400.

The previous prime is 2178026597. The next prime is 2178026629. The reversal of 2178026628 is 8266208712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2178026628.

It is not an unprimeable number, because it can be changed into a prime (2178026629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121048 + ... + 137871.

It is an arithmetic number, because the mean of its divisors is an integer number (212055480).

Almost surely, 2^2178026628 is an apocalyptic number.

It is an amenable number.

2178026628 is an abundant number, since it is smaller than the sum of its proper divisors (2911304892).

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

2178026628 is a wasteful number, since it uses less digits than its factorization.

2178026628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259627 (or 259625 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 2178026628 is about 46669.3328428852. The cubic root of 2178026628 is about 1296.2468927398.

The spelling of 2178026628 in words is "two billion, one hundred seventy-eight million, twenty-six thousand, six hundred twenty-eight".