381547780 has 24 divisors (see below), whose sum is σ = 828880920. Its totient is φ = 147356160.

The previous prime is 381547709. The next prime is 381547787. The reversal of 381547780 is 87745183.

It can be written as a sum of positive squares in 4 ways, for example, as 78996544 + 302551236 = 8888^2 + 17394^2 .

It is not an unprimeable number, because it can be changed into a prime (381547787) 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, 328341 + ... + 329500.

It is an arithmetic number, because the mean of its divisors is an integer number (34536705).

Almost surely, 2^381547780 is an apocalyptic number.

It is an amenable number.

381547780 is an abundant number, since it is smaller than the sum of its proper divisors (447333140).

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

381547780 is a wasteful number, since it uses less digits than its factorization.

381547780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657879 (or 657877 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 381547780 is about 19533.2480657980. The cubic root of 381547780 is about 725.2977168081.

The spelling of 381547780 in words is "three hundred eighty-one million, five hundred forty-seven thousand, seven hundred eighty".