197777664 has 108 divisors (see below), whose sum is σ = 651758016. Its totient is φ = 56503296.

The previous prime is 197777653. The next prime is 197777687. The reversal of 197777664 is 466777791.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 197777664.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9997 + ... + 22259.

Almost surely, 2^197777664 is an apocalyptic number.

197777664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197777664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325879008).

197777664 is an abundant number, since it is smaller than the sum of its proper divisors (453980352).

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

197777664 is a wasteful number, since it uses less digits than its factorization.

197777664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12292 (or 12275 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 54.

The square root of 197777664 is about 14063.3446946308. The cubic root of 197777664 is about 582.6294249671.

The spelling of 197777664 in words is "one hundred ninety-seven million, seven hundred seventy-seven thousand, six hundred sixty-four".