161979768 has 24 divisors (see below), whose sum is σ = 438695400. Its totient is φ = 53993232.

The previous prime is 161979767. The next prime is 161979781. The reversal of 161979768 is 867979161.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161979767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1124788 + ... + 1124931.

It is an arithmetic number, because the mean of its divisors is an integer number (18278975).

Almost surely, 2^161979768 is an apocalyptic number.

161979768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161979768 is an abundant number, since it is smaller than the sum of its proper divisors (276715632).

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

161979768 is a wasteful number, since it uses less digits than its factorization.

161979768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2249731 (or 2249724 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 161979768 is about 12727.1272485192. The cubic root of 161979768 is about 545.1134830877.

The spelling of 161979768 in words is "one hundred sixty-one million, nine hundred seventy-nine thousand, seven hundred sixty-eight".