378787505 has 4 divisors (see below), whose sum is σ = 454545012. Its totient is φ = 303030000.

The previous prime is 378787501. The next prime is 378787511. The reversal of 378787505 is 505787873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113976976 + 264810529 = 10676^2 + 16273^2 .

It is not a de Polignac number, because 378787505 - 2² = 378787501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (378787501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37878746 + ... + 37878755.

It is an arithmetic number, because the mean of its divisors is an integer number (113636253).

Almost surely, 2^378787505 is an apocalyptic number.

It is an amenable number.

378787505 is a deficient number, since it is larger than the sum of its proper divisors (75757507).

378787505 is an equidigital number, since it uses as much as digits as its factorization.

378787505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75757506.

The product of its (nonzero) digits is 1646400, while the sum is 50.

The square root of 378787505 is about 19462.4640012512. The cubic root of 378787505 is about 723.5444471213.

The spelling of 378787505 in words is "three hundred seventy-eight million, seven hundred eighty-seven thousand, five hundred five".