378772665 has 16 divisors (see below), whose sum is σ = 641685888. Its totient is φ = 190128896.

The previous prime is 378772661. The next prime is 378772679. The reversal of 378772665 is 566277873.

It is a cyclic number.

It is not a de Polignac number, because 378772665 - 2² = 378772661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (378772661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 742437 + ... + 742946.

It is an arithmetic number, because the mean of its divisors is an integer number (40105368).

Almost surely, 2^378772665 is an apocalyptic number.

It is an amenable number.

378772665 is a deficient number, since it is larger than the sum of its proper divisors (262913223).

378772665 is a wasteful number, since it uses less digits than its factorization.

378772665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485408.

The product of its digits is 2963520, while the sum is 51.

The square root of 378772665 is about 19462.0827508260. The cubic root of 378772665 is about 723.5349980770.

The spelling of 378772665 in words is "three hundred seventy-eight million, seven hundred seventy-two thousand, six hundred sixty-five".