52775721 has 12 divisors (see below), whose sum is σ = 76531572. Its totient is φ = 35045376.

The previous prime is 52775719. The next prime is 52775743. The reversal of 52775721 is 12757725.

It can be written as a sum of positive squares in 2 ways, for example, as 52359696 + 416025 = 7236^2 + 645^2 .

It is not a de Polignac number, because 52775721 - 2¹ = 52775719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (52775761) 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, 9096 + ... + 13721.

It is an arithmetic number, because the mean of its divisors is an integer number (6377631).

Almost surely, 2^52775721 is an apocalyptic number.

It is an amenable number.

52775721 is a deficient number, since it is larger than the sum of its proper divisors (23755851).

52775721 is a wasteful number, since it uses less digits than its factorization.

52775721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23080 (or 23077 counting only the distinct ones).

The product of its digits is 34300, while the sum is 36.

The square root of 52775721 is about 7264.6900140336. The cubic root of 52775721 is about 375.0979797310.

The spelling of 52775721 in words is "fifty-two million, seven hundred seventy-five thousand, seven hundred twenty-one".