72134178 has 16 divisors (see below), whose sum is σ = 145238400. Its totient is φ = 23883056.

The previous prime is 72134173. The next prime is 72134191. The reversal of 72134178 is 87143127.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (72134173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39450 + ... + 41237.

It is an arithmetic number, because the mean of its divisors is an integer number (9077400).

Almost surely, 2^72134178 is an apocalyptic number.

72134178 is an abundant number, since it is smaller than the sum of its proper divisors (73104222).

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

72134178 is a wasteful number, since it uses less digits than its factorization.

72134178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80841.

The product of its digits is 9408, while the sum is 33.

The square root of 72134178 is about 8493.1842085286. The cubic root of 72134178 is about 416.2750315457.

The spelling of 72134178 in words is "seventy-two million, one hundred thirty-four thousand, one hundred seventy-eight".