53312220 has 72 divisors (see below), whose sum is σ = 174160896. Its totient is φ = 13122432.

The previous prime is 53312213. The next prime is 53312239. The reversal of 53312220 is 2221335.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 53312193 and 53312202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9052 + ... + 13731.

Almost surely, 2^53312220 is an apocalyptic number.

It is an amenable number.

53312220 is an abundant number, since it is smaller than the sum of its proper divisors (120848676).

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

53312220 is a wasteful number, since it uses less digits than its factorization.

53312220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22811 (or 22806 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 53312220 is about 7301.5217591951. The cubic root of 53312220 is about 376.3647339781.

Adding to 53312220 its reverse (2221335), we get a palindrome (55533555).

The spelling of 53312220 in words is "fifty-three million, three hundred twelve thousand, two hundred twenty".