72205861 has 24 divisors (see below), whose sum is σ = 91010304. Its totient is φ = 56780640.

The previous prime is 72205849. The next prime is 72205877. The reversal of 72205861 is 16850227.

It is not a de Polignac number, because 72205861 - 2¹³ = 72197669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72205891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167316 + ... + 167746.

It is an arithmetic number, because the mean of its divisors is an integer number (3792096).

Almost surely, 2^72205861 is an apocalyptic number.

It is an amenable number.

72205861 is a deficient number, since it is larger than the sum of its proper divisors (18804443).

72205861 is a wasteful number, since it uses less digits than its factorization.

72205861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 72205861 is about 8497.4031915639. The cubic root of 72205861 is about 416.4128763463.

The spelling of 72205861 in words is "seventy-two million, two hundred five thousand, eight hundred sixty-one".