197878620 has 48 divisors (see below), whose sum is σ = 556905888. Its totient is φ = 52496640.

The previous prime is 197878613. The next prime is 197878621. The reversal of 197878620 is 26878791.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 197878620.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197878621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3450 + ... + 20190.

It is an arithmetic number, because the mean of its divisors is an integer number (11602206).

Almost surely, 2^197878620 is an apocalyptic number.

197878620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197878620 is an abundant number, since it is smaller than the sum of its proper divisors (359027268).

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

197878620 is a wasteful number, since it uses less digits than its factorization.

197878620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16950 (or 16948 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 197878620 is about 14066.9335677681. The cubic root of 197878620 is about 582.7285428851.

The spelling of 197878620 in words is "one hundred ninety-seven million, eight hundred seventy-eight thousand, six hundred twenty".