197638309764 has 36 divisors (see below), whose sum is σ = 570955117824. Its totient is φ = 56468088432.

The previous prime is 197638309613. The next prime is 197638309801. The reversal of 197638309764 is 467903836791.

197638309764 is a `hidden beast` number, since 197 + 6 + 383 + 0 + 9 + 7 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×197638309764³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 392139252 + ... + 392139755.

It is an arithmetic number, because the mean of its divisors is an integer number (15859864384).

Almost surely, 2^197638309764 is an apocalyptic number.

197638309764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

197638309764 is an abundant number, since it is smaller than the sum of its proper divisors (373316808060).

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

197638309764 is a wasteful number, since it uses less digits than its factorization.

197638309764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784279024 (or 784279019 counting only the distinct ones).

The product of its (nonzero) digits is 41150592, while the sum is 63.

The spelling of 197638309764 in words is "one hundred ninety-seven billion, six hundred thirty-eight million, three hundred nine thousand, seven hundred sixty-four".