53220040 has 16 divisors (see below), whose sum is σ = 119745180. Its totient is φ = 21288000.

The previous prime is 53220029. The next prime is 53220053. The reversal of 53220040 is 4002235.

It can be written as a sum of positive squares in 2 ways, for example, as 43322724 + 9897316 = 6582^2 + 3146^2 .

It is a junction number, because it is equal to n+sod(n) for n = 53219996 and 53220023.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665211 + ... + 665290.

Almost surely, 2^53220040 is an apocalyptic number.

It is an amenable number.

53220040 is an abundant number, since it is smaller than the sum of its proper divisors (66525140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53220040 is a wasteful number, since it uses less digits than its factorization.

53220040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330512 (or 1330508 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 53220040 is about 7295.2066454625. The cubic root of 53220040 is about 376.1476898307.

Adding to 53220040 its reverse (4002235), we get a palindrome (57222275).

The spelling of 53220040 in words is "fifty-three million, two hundred twenty thousand, forty".