197728404 has 24 divisors (see below), whose sum is σ = 472620288. Its totient is φ = 64301760.

The previous prime is 197728381. The next prime is 197728423. The reversal of 197728404 is 404827791.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200452 + ... + 201435.

It is an arithmetic number, because the mean of its divisors is an integer number (19692512).

Almost surely, 2^197728404 is an apocalyptic number.

It is an amenable number.

197728404 is an abundant number, since it is smaller than the sum of its proper divisors (274891884).

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

197728404 is a wasteful number, since it uses less digits than its factorization.

197728404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401935 (or 401933 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 197728404 is about 14061.5932240980. The cubic root of 197728404 is about 582.5810495878.

It can be divided in two parts, 1977 and 28404, that added together give a triangular number (30381 = T₂₄₆).

The spelling of 197728404 in words is "one hundred ninety-seven million, seven hundred twenty-eight thousand, four hundred four".