72215849 has 4 divisors (see below), whose sum is σ = 72279636. Its totient is φ = 72152064.

The previous prime is 72215831. The next prime is 72215863. The reversal of 72215849 is 94851227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35188624 + 37027225 = 5932^2 + 6085^2 .

It is a cyclic number.

It is not a de Polignac number, because 72215849 - 2⁸ = 72215593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72215149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30164 + ... + 32469.

It is an arithmetic number, because the mean of its divisors is an integer number (18069909).

Almost surely, 2^72215849 is an apocalyptic number.

It is an amenable number.

72215849 is a deficient number, since it is larger than the sum of its proper divisors (63787).

72215849 is a wasteful number, since it uses less digits than its factorization.

72215849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63786.

The product of its digits is 40320, while the sum is 38.

The square root of 72215849 is about 8497.9908802022. The cubic root of 72215849 is about 416.4320758037.

The spelling of 72215849 in words is "seventy-two million, two hundred fifteen thousand, eight hundred forty-nine".