52765021 has 4 divisors (see below), whose sum is σ = 52829500. Its totient is φ = 52700544.

The previous prime is 52765019. The next prime is 52765039. The reversal of 52765021 is 12056725.

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 20115225 + 32649796 = 4485^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 52765021 - 2¹ = 52765019 is a prime.

It is a super-2 number, since 2×52765021² = 5568294882260882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52765001) 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, 30996 + ... + 32653.

It is an arithmetic number, because the mean of its divisors is an integer number (13207375).

Almost surely, 2^52765021 is an apocalyptic number.

It is an amenable number.

52765021 is a deficient number, since it is larger than the sum of its proper divisors (64479).

52765021 is an equidigital number, since it uses as much as digits as its factorization.

52765021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64478.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 52765021 is about 7263.9535378470. The cubic root of 52765021 is about 375.0726283031.

The spelling of 52765021 in words is "fifty-two million, seven hundred sixty-five thousand, twenty-one".