72211861 has 8 divisors (see below), whose sum is σ = 73575648. Its totient is φ = 70854000.

The previous prime is 72211847. The next prime is 72211877. The reversal of 72211861 is 16811227.

72211861 = T₂₇₈ + T₂₇₉ + ... + T₇₆₈.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72211861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72211831) 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, 28746 + ... + 31156.

It is an arithmetic number, because the mean of its divisors is an integer number (9196956).

Almost surely, 2^72211861 is an apocalyptic number.

It is an amenable number.

72211861 is a deficient number, since it is larger than the sum of its proper divisors (1363787).

72211861 is a wasteful number, since it uses less digits than its factorization.

72211861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2963.

The product of its digits is 1344, while the sum is 28.

The square root of 72211861 is about 8497.7562332653. The cubic root of 72211861 is about 416.4244100733.

The spelling of 72211861 in words is "seventy-two million, two hundred eleven thousand, eight hundred sixty-one".