378897664 has 36 divisors (see below), whose sum is σ = 757823220. Its totient is φ = 189071360.

The previous prime is 378897641. The next prime is 378897709. The reversal of 378897664 is 466798873.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 329785600 + 49112064 = 18160^2 + 7008^2 .

It is a junction number, because it is equal to n+sod(n) for n = 378897599 and 378897608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162942 + ... + 165250.

It is an arithmetic number, because the mean of its divisors is an integer number (21050645).

Almost surely, 2^378897664 is an apocalyptic number.

It is an amenable number.

378897664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

378897664 is an equidigital number, since it uses as much as digits as its factorization.

378897664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966 (or 2952 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 58.

The square root of 378897664 is about 19465.2938328709. The cubic root of 378897664 is about 723.6145807330.

The spelling of 378897664 in words is "three hundred seventy-eight million, eight hundred ninety-seven thousand, six hundred sixty-four".