263778606 has 160 divisors (see below), whose sum is σ = 753762240. Its totient is φ = 67060224.

The previous prime is 263778563. The next prime is 263778607. The reversal of 263778606 is 606877362.

263778606 is a `hidden beast` number, since 2 + 6 + 37 + 7 + 8 + 606 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263778607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 427210 + ... + 427826.

It is an arithmetic number, because the mean of its divisors is an integer number (4711014).

Almost surely, 2^263778606 is an apocalyptic number.

263778606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 263778606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376881120).

263778606 is an abundant number, since it is smaller than the sum of its proper divisors (489983634).

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

263778606 is a wasteful number, since it uses less digits than its factorization.

263778606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The square root of 263778606 is about 16241.2624509303. The cubic root of 263778606 is about 641.3274903790.

The spelling of 263778606 in words is "two hundred sixty-three million, seven hundred seventy-eight thousand, six hundred six".