72215055 has 48 divisors (see below), whose sum is σ = 142511616. Its totient is φ = 33485760.

The previous prime is 72215053. The next prime is 72215057. The reversal of 72215055 is 55051227.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72215053) and next prime (72215057).

It is not a de Polignac number, because 72215055 - 2¹ = 72215053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72215053) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8214 + ... + 14556.

It is an arithmetic number, because the mean of its divisors is an integer number (2968992).

Almost surely, 2^72215055 is an apocalyptic number.

72215055 is a deficient number, since it is larger than the sum of its proper divisors (70296561).

72215055 is a wasteful number, since it uses less digits than its factorization.

72215055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6388 (or 6385 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 72215055 is about 8497.9441631491. The cubic root of 72215055 is about 416.4305496000.

The spelling of 72215055 in words is "seventy-two million, two hundred fifteen thousand, fifty-five".