381531978456 has 32 divisors (see below), whose sum is σ = 984598656000. Its totient is φ = 123074831520.

The previous prime is 381531978449. The next prime is 381531978461. The reversal of 381531978456 is 654879135183.

It is a self number, because there is not a number n which added to its sum of digits gives 381531978456.

It is a congruent number.

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, 256405156 + ... + 256406643.

It is an arithmetic number, because the mean of its divisors is an integer number (30768708000).

Almost surely, 2^381531978456 is an apocalyptic number.

It is an amenable number.

381531978456 is an abundant number, since it is smaller than the sum of its proper divisors (603066677544).

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

381531978456 is a wasteful number, since it uses less digits than its factorization.

381531978456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512811839 (or 512811835 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 60.

The spelling of 381531978456 in words is "three hundred eighty-one billion, five hundred thirty-one million, nine hundred seventy-eight thousand, four hundred fifty-six".