72255726 has 40 divisors (see below), whose sum is σ = 162815664. Its totient is φ = 23950080.

The previous prime is 72255697. The next prime is 72255731. The reversal of 72255726 is 62755227.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30111 + ... + 32421.

Almost surely, 2^72255726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72255726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81407832).

72255726 is an abundant number, since it is smaller than the sum of its proper divisors (90559938).

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

72255726 is a wasteful number, since it uses less digits than its factorization.

72255726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518 (or 2509 counting only the distinct ones).

The product of its digits is 58800, while the sum is 36.

The square root of 72255726 is about 8500.3368168561. The cubic root of 72255726 is about 416.5087118260.

The spelling of 72255726 in words is "seventy-two million, two hundred fifty-five thousand, seven hundred twenty-six".