200378781 has 6 divisors (see below), whose sum is σ = 289436030. Its totient is φ = 133585848.

The previous prime is 200378749. The next prime is 200378819. The reversal of 200378781 is 187873002.

200378781 is a `hidden beast` number, since 200 + 378 + 7 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 198556281 + 1822500 = 14091^2 + 1350^2 .

It is not a de Polignac number, because 200378781 - 2⁵ = 200378749 is a prime.

It is a super-2 number, since 2×200378781² = 80303311750091922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200378281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11132146 + ... + 11132163.

Almost surely, 2^200378781 is an apocalyptic number.

It is an amenable number.

200378781 is a deficient number, since it is larger than the sum of its proper divisors (89057249).

200378781 is a wasteful number, since it uses less digits than its factorization.

200378781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22264315 (or 22264312 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 200378781 is about 14155.5212196514. The cubic root of 200378781 is about 585.1725022731.

The spelling of 200378781 in words is "two hundred million, three hundred seventy-eight thousand, seven hundred eighty-one".