646800198 has 16 divisors (see below), whose sum is σ = 1411200576. Its totient is φ = 196000040.

The previous prime is 646800197. The next prime is 646800233. The reversal of 646800198 is 891008646.

It is a super-2 number, since 2×646800198² = 836700992265678408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646800197) 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, 4899936 + ... + 4900067.

It is an arithmetic number, because the mean of its divisors is an integer number (88200036).

Almost surely, 2^646800198 is an apocalyptic number.

646800198 is an abundant number, since it is smaller than the sum of its proper divisors (764400378).

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

646800198 is a wasteful number, since it uses less digits than its factorization.

646800198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9800019.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 646800198 is about 25432.2668671119. The cubic root of 646800198 is about 864.8153338513.

The spelling of 646800198 in words is "six hundred forty-six million, eight hundred thousand, one hundred ninety-eight".