190778320 has 20 divisors (see below), whose sum is σ = 443559780. Its totient is φ = 76311296.

The previous prime is 190778281. The next prime is 190778363. The reversal of 190778320 is 23877091.

It can be written as a sum of positive squares in 2 ways, for example, as 22505536 + 168272784 = 4744^2 + 12972^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 190778320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1192285 + ... + 1192444.

It is an arithmetic number, because the mean of its divisors is an integer number (22177989).

Almost surely, 2^190778320 is an apocalyptic number.

190778320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

190778320 is an abundant number, since it is smaller than the sum of its proper divisors (252781460).

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

190778320 is a wasteful number, since it uses less digits than its factorization.

190778320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384742 (or 2384736 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 190778320 is about 13812.2525317198. The cubic root of 190778320 is about 575.6736352023.

The spelling of 190778320 in words is "one hundred ninety million, seven hundred seventy-eight thousand, three hundred twenty".