53720217 has 12 divisors (see below), whose sum is σ = 79060644. Its totient is φ = 35137440.

The previous prime is 53720207. The next prime is 53720243. The reversal of 53720217 is 71202735.

It can be written as a sum of positive squares in 2 ways, for example, as 43086096 + 10634121 = 6564^2 + 3261^2 .

It is not a de Polignac number, because 53720217 - 2⁷ = 53720089 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (53720207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55834 + ... + 56787.

It is an arithmetic number, because the mean of its divisors is an integer number (6588387).

Almost surely, 2^53720217 is an apocalyptic number.

It is an amenable number.

53720217 is a deficient number, since it is larger than the sum of its proper divisors (25340427).

53720217 is a wasteful number, since it uses less digits than its factorization.

53720217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112680 (or 112677 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 53720217 is about 7329.4076841175. The cubic root of 53720217 is about 377.3223982196.

The spelling of 53720217 in words is "fifty-three million, seven hundred twenty thousand, two hundred seventeen".