53820905 has 8 divisors (see below), whose sum is σ = 66160584. Its totient is φ = 42006400.

The previous prime is 53820859. The next prime is 53820937. The reversal of 53820905 is 50902835.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 399424 + 53421481 = 632^2 + 7309^2 .

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

It is not a de Polignac number, because 53820905 - 2⁶ = 53820841 is a prime.

It is a super-4 number, since 4×53820905⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131066 + ... + 131475.

It is an arithmetic number, because the mean of its divisors is an integer number (8270073).

Almost surely, 2^53820905 is an apocalyptic number.

It is an amenable number.

53820905 is a deficient number, since it is larger than the sum of its proper divisors (12339679).

53820905 is a wasteful number, since it uses less digits than its factorization.

53820905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262587.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 53820905 is about 7336.2732364600. The cubic root of 53820905 is about 377.5579900095.

The spelling of 53820905 in words is "fifty-three million, eight hundred twenty thousand, nine hundred five".