168137540 has 24 divisors (see below), whose sum is σ = 354681600. Its totient is φ = 66951648.

The previous prime is 168137467. The next prime is 168137573. The reversal of 168137540 is 45731861.

It is a self number, because there is not a number n which added to its sum of digits gives 168137540.

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, 14390 + ... + 23309.

It is an arithmetic number, because the mean of its divisors is an integer number (14778400).

Almost surely, 2^168137540 is an apocalyptic number.

168137540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168137540 is an abundant number, since it is smaller than the sum of its proper divisors (186544060).

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

168137540 is a wasteful number, since it uses less digits than its factorization.

168137540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37931 (or 37929 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 168137540 is about 12966.7860320127. The cubic root of 168137540 is about 551.9353745319.

The spelling of 168137540 in words is "one hundred sixty-eight million, one hundred thirty-seven thousand, five hundred forty".