378221640 has 32 divisors (see below), whose sum is σ = 1134665280. Its totient is φ = 100859072.

The previous prime is 378221611. The next prime is 378221647. The reversal of 378221640 is 46122873.

It is not an unprimeable number, because it can be changed into a prime (378221647) 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, 1575804 + ... + 1576043.

It is an arithmetic number, because the mean of its divisors is an integer number (35458290).

Almost surely, 2^378221640 is an apocalyptic number.

378221640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

378221640 is an abundant number, since it is smaller than the sum of its proper divisors (756443640).

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

378221640 is a wasteful number, since it uses less digits than its factorization.

378221640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151861 (or 3151857 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 378221640 is about 19447.9212256735. The cubic root of 378221640 is about 723.1839701413.

The spelling of 378221640 in words is "three hundred seventy-eight million, two hundred twenty-one thousand, six hundred forty".