190997780 has 12 divisors (see below), whose sum is σ = 401095380. Its totient is φ = 76399104.

The previous prime is 190997777. The next prime is 190997813. The reversal of 190997780 is 87799091.

190997780 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 26234884 + 164762896 = 5122^2 + 12836^2 .

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, 4774925 + ... + 4774964.

It is an arithmetic number, because the mean of its divisors is an integer number (33424615).

Almost surely, 2^190997780 is an apocalyptic number.

190997780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

190997780 is an abundant number, since it is smaller than the sum of its proper divisors (210097600).

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

190997780 is a wasteful number, since it uses less digits than its factorization.

190997780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9549898 (or 9549896 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 190997780 is about 13820.1946440707. The cubic root of 190997780 is about 575.8942908185.

The spelling of 190997780 in words is "one hundred ninety million, nine hundred ninety-seven thousand, seven hundred eighty".