195778840 has 32 divisors (see below), whose sum is σ = 452411280. Its totient is φ = 76194432.

The previous prime is 195778837. The next prime is 195778841. The reversal of 195778840 is 48877591.

195778840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195778841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64662 + ... + 67621.

Almost surely, 2^195778840 is an apocalyptic number.

195778840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195778840 is an abundant number, since it is smaller than the sum of its proper divisors (256632440).

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

195778840 is a wasteful number, since it uses less digits than its factorization.

195778840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132331 (or 132327 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 49.

The square root of 195778840 is about 13992.0991991909. The cubic root of 195778840 is about 580.6600096575.

The spelling of 195778840 in words is "one hundred ninety-five million, seven hundred seventy-eight thousand, eight hundred forty".