162780138 has 32 divisors (see below), whose sum is σ = 366837120. Its totient is φ = 53494560.

The previous prime is 162780133. The next prime is 162780139. The reversal of 162780138 is 831087261.

It is not an unprimeable number, because it can be changed into a prime (162780133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17395 + ... + 25062.

It is an arithmetic number, because the mean of its divisors is an integer number (11463660).

Almost surely, 2^162780138 is an apocalyptic number.

162780138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

162780138 is an abundant number, since it is smaller than the sum of its proper divisors (204056982).

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

162780138 is a wasteful number, since it uses less digits than its factorization.

162780138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42539 (or 42533 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 162780138 is about 12758.5319688434. The cubic root of 162780138 is about 546.0098416291.

The spelling of 162780138 in words is "one hundred sixty-two million, seven hundred eighty thousand, one hundred thirty-eight".