997878160 has 40 divisors (see below), whose sum is σ = 2382778296. Its totient is φ = 388362240.

The previous prime is 997878149. The next prime is 997878289. The reversal of 997878160 is 61878799.

It can be written as a sum of positive squares in 4 ways, for example, as 51208336 + 946669824 = 7156^2 + 30768^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 165601 + ... + 171520.

Almost surely, 2^997878160 is an apocalyptic number.

It is an amenable number.

997878160 is an abundant number, since it is smaller than the sum of its proper divisors (1384900136).

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

997878160 is a wasteful number, since it uses less digits than its factorization.

997878160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337171 (or 337165 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 55.

The square root of 997878160 is about 31589.2095500980. The cubic root of 997878160 is about 999.2922191645.

The spelling of 997878160 in words is "nine hundred ninety-seven million, eight hundred seventy-eight thousand, one hundred sixty".