198720777 has 8 divisors (see below), whose sum is σ = 265939840. Its totient is φ = 131991120.

The previous prime is 198720773. The next prime is 198720779. The reversal of 198720777 is 777027891.

198720777 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198720777 - 2² = 198720773 is a prime.

It is a super-2 number, since 2×198720777² = 78979894422967458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198720773) 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, 121402 + ... + 123027.

It is an arithmetic number, because the mean of its divisors is an integer number (33242480).

Almost surely, 2^198720777 is an apocalyptic number.

It is an amenable number.

198720777 is a deficient number, since it is larger than the sum of its proper divisors (67219063).

198720777 is a wasteful number, since it uses less digits than its factorization.

198720777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244703.

The product of its (nonzero) digits is 345744, while the sum is 48.

The square root of 198720777 is about 14096.8357087681. The cubic root of 198720777 is about 583.5540562995.

The spelling of 198720777 in words is "one hundred ninety-eight million, seven hundred twenty thousand, seven hundred seventy-seven".