72205278 has 16 divisors (see below), whose sum is σ = 148314000. Its totient is φ = 23417856.

The previous prime is 72205277. The next prime is 72205291. The reversal of 72205278 is 87250227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72205271) 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, 162403 + ... + 162846.

It is an arithmetic number, because the mean of its divisors is an integer number (9269625).

Almost surely, 2^72205278 is an apocalyptic number.

72205278 is an abundant number, since it is smaller than the sum of its proper divisors (76108722).

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

72205278 is a wasteful number, since it uses less digits than its factorization.

72205278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325291.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 72205278 is about 8497.3688868967. The cubic root of 72205278 is about 416.4117556184.

The spelling of 72205278 in words is "seventy-two million, two hundred five thousand, two hundred seventy-eight".