1638078852 has 24 divisors (see below), whose sum is σ = 3822866656. Its totient is φ = 545928768.

The previous prime is 1638078847. The next prime is 1638078919. The reversal of 1638078852 is 2588708361.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96723 + ... + 112389.

Almost surely, 2^1638078852 is an apocalyptic number.

1638078852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1638078852 is an abundant number, since it is smaller than the sum of its proper divisors (2184787804).

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

1638078852 is a wasteful number, since it uses less digits than its factorization.

1638078852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24387 (or 24385 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 1638078852 is about 40473.1868278247. The cubic root of 1638078852 is about 1178.8130485325.

The spelling of 1638078852 in words is "one billion, six hundred thirty-eight million, seventy-eight thousand, eight hundred fifty-two".