381578646 has 16 divisors (see below), whose sum is σ = 780905664. Its totient is φ = 124234824.

The previous prime is 381578621. The next prime is 381578647. The reversal of 381578646 is 646875183.

It is a junction number, because it is equal to n+sod(n) for n = 381578595 and 381578604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381578647) 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, 739236 + ... + 739751.

It is an arithmetic number, because the mean of its divisors is an integer number (48806604).

Almost surely, 2^381578646 is an apocalyptic number.

381578646 is an abundant number, since it is smaller than the sum of its proper divisors (399327018).

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

381578646 is a wasteful number, since it uses less digits than its factorization.

381578646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479035.

The product of its digits is 967680, while the sum is 48.

The square root of 381578646 is about 19534.0381385928. The cubic root of 381578646 is about 725.3172743724.

The spelling of 381578646 in words is "three hundred eighty-one million, five hundred seventy-eight thousand, six hundred forty-six".