197028655 has 4 divisors (see below), whose sum is σ = 236434392. Its totient is φ = 157622920.

The previous prime is 197028647. The next prime is 197028661. The reversal of 197028655 is 556820791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 556820791 = 31 ⋅17961961.

It is not a de Polignac number, because 197028655 - 2³ = 197028647 is a prime.

It is a super-2 number, since 2×197028655² = 77640581782218050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19702861 + ... + 19702870.

It is an arithmetic number, because the mean of its divisors is an integer number (59108598).

Almost surely, 2^197028655 is an apocalyptic number.

197028655 is a deficient number, since it is larger than the sum of its proper divisors (39405737).

197028655 is an equidigital number, since it uses as much as digits as its factorization.

197028655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39405736.

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 197028655 is about 14036.6896026093. The cubic root of 197028655 is about 581.8929974555.

It can be divided in two parts, 1970 and 28655, that added together give a square (30625 = 175²).

The spelling of 197028655 in words is "one hundred ninety-seven million, twenty-eight thousand, six hundred fifty-five".