53087821 has 8 divisors (see below), whose sum is σ = 57272184. Its totient is φ = 49021440.

The previous prime is 53087807. The next prime is 53087833. The reversal of 53087821 is 12878035.

It can be written as a sum of positive squares in 4 ways, for example, as 13586596 + 39501225 = 3686^2 + 6285^2 .

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 53087821 - 2¹³ = 53079629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53087851) 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, 28560 + ... + 30361.

It is an arithmetic number, because the mean of its divisors is an integer number (7159023).

Almost surely, 2^53087821 is an apocalyptic number.

It is an amenable number.

53087821 is a deficient number, since it is larger than the sum of its proper divisors (4184363).

53087821 is a wasteful number, since it uses less digits than its factorization.

53087821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58991.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 53087821 is about 7286.1389638134. The cubic root of 53087821 is about 375.8359331168.

The spelling of 53087821 in words is "fifty-three million, eighty-seven thousand, eight hundred twenty-one".