565404378 has 64 divisors (see below), whose sum is σ = 1412398080. Its totient is φ = 146592000.

The previous prime is 565404353. The next prime is 565404379. The reversal of 565404378 is 873404565.

565404378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

565404378 is a nontrivial binomial coefficient, being equal to C(33628, 2).

It is a super-2 number, since 2×565404378² = 639364221323133768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (565404379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 470178 + ... + 471378.

It is an arithmetic number, because the mean of its divisors is an integer number (22068720).

Almost surely, 2^565404378 is an apocalyptic number.

565404378 is the 33627-th triangular number and also the 16814-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 565404378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (706199040).

565404378 is an abundant number, since it is smaller than the sum of its proper divisors (846993702).

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

565404378 is a wasteful number, since it uses less digits than its factorization.

565404378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2243.

The product of its (nonzero) digits is 403200, while the sum is 42.

The square root of 565404378 is about 23778.2332817222. The cubic root of 565404378 is about 826.9001213338.

The spelling of 565404378 in words is "five hundred sixty-five million, four hundred four thousand, three hundred seventy-eight".