52720405 has 8 divisors (see below), whose sum is σ = 65446200. Its totient is φ = 40721856.

The previous prime is 52720403. The next prime is 52720441. The reversal of 52720405 is 50402725.

It can be written as a sum of positive squares in 4 ways, for example, as 4153444 + 48566961 = 2038^2 + 6969^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 52720405 - 2¹ = 52720403 is a prime.

It is a super-2 number, since 2×52720405² = 5558882206728050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 52720405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52720403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181650 + ... + 181939.

It is an arithmetic number, because the mean of its divisors is an integer number (8180775).

Almost surely, 2^52720405 is an apocalyptic number.

It is an amenable number.

52720405 is a deficient number, since it is larger than the sum of its proper divisors (12725795).

52720405 is a wasteful number, since it uses less digits than its factorization.

52720405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363623.

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 52720405 is about 7260.8818334965. The cubic root of 52720405 is about 374.9668830014.

The spelling of 52720405 in words is "fifty-two million, seven hundred twenty thousand, four hundred five".