72091078 has 4 divisors (see below), whose sum is σ = 108136620. Its totient is φ = 36045538.

The previous prime is 72091069. The next prime is 72091093. The reversal of 72091078 is 87019027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87019027 = 191 ⋅455597.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18022768 + ... + 18022771.

It is an arithmetic number, because the mean of its divisors is an integer number (27034155).

Almost surely, 2^72091078 is an apocalyptic number.

72091078 is a deficient number, since it is larger than the sum of its proper divisors (36045542).

72091078 is a wasteful number, since it uses less digits than its factorization.

72091078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36045541.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 72091078 is about 8490.6465007089. The cubic root of 72091078 is about 416.1921072470.

The spelling of 72091078 in words is "seventy-two million, ninety-one thousand, seventy-eight".