72129074 has 8 divisors (see below), whose sum is σ = 108361260. Its totient is φ = 36008656.

The previous prime is 72129019. The next prime is 72129077. The reversal of 72129074 is 47092127.

It can be written as a sum of positive squares in 2 ways, for example, as 67947049 + 4182025 = 8243^2 + 2045^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 72129074.

It is not an unprimeable number, because it can be changed into a prime (72129077) 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 3 ways as a sum of consecutive naturals, for example, 26309 + ... + 28920.

Almost surely, 2^72129074 is an apocalyptic number.

72129074 is a deficient number, since it is larger than the sum of its proper divisors (36232186).

72129074 is a wasteful number, since it uses less digits than its factorization.

72129074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55884.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 72129074 is about 8492.8837269799. The cubic root of 72129074 is about 416.2652131862.

The spelling of 72129074 in words is "seventy-two million, one hundred twenty-nine thousand, seventy-four".