72720078 has 16 divisors (see below), whose sum is σ = 145811280. Its totient is φ = 24178176.

The previous prime is 72720071. The next prime is 72720091. The reversal of 72720078 is 87002727.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72720071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12883 + ... + 17646.

It is an arithmetic number, because the mean of its divisors is an integer number (9113205).

Almost surely, 2^72720078 is an apocalyptic number.

72720078 is an abundant number, since it is smaller than the sum of its proper divisors (73091202).

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

72720078 is a wasteful number, since it uses less digits than its factorization.

72720078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30931.

The product of its (nonzero) digits is 10976, while the sum is 33.

The square root of 72720078 is about 8527.6068155140. The cubic root of 72720078 is about 417.3990394957.

The spelling of 72720078 in words is "seventy-two million, seven hundred twenty thousand, seventy-eight".