838705644 has 48 divisors (see below), whose sum is σ = 2485056000. Its totient is φ = 239629968.

The previous prime is 838705627. The next prime is 838705661. The reversal of 838705644 is 446507838.

838705644 is a `hidden beast` number, since 8 + 3 + 87 + 0 + 564 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (838705627) and next prime (838705661).

It is a self number, because there is not a number n which added to its sum of digits gives 838705644.

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, 553944 + ... + 555455.

It is an arithmetic number, because the mean of its divisors is an integer number (51772000).

Almost surely, 2^838705644 is an apocalyptic number.

838705644 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

838705644 is an abundant number, since it is smaller than the sum of its proper divisors (1646350356).

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

838705644 is a wasteful number, since it uses less digits than its factorization.

838705644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109419 (or 1109411 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 838705644 is about 28960.4151213342. The cubic root of 838705644 is about 943.0539139494.

The spelling of 838705644 in words is "eight hundred thirty-eight million, seven hundred five thousand, six hundred forty-four".