53220645 has 64 divisors (see below), whose sum is σ = 99502080. Its totient is φ = 27293760.

The previous prime is 53220631. The next prime is 53220649. The reversal of 53220645 is 54602235.

It is not a de Polignac number, because 53220645 - 2⁵ = 53220613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53220649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 338907 + ... + 339063.

It is an arithmetic number, because the mean of its divisors is an integer number (1554720).

Almost surely, 2^53220645 is an apocalyptic number.

It is an amenable number.

53220645 is a deficient number, since it is larger than the sum of its proper divisors (46281435).

53220645 is an equidigital number, since it uses as much as digits as its factorization.

53220645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 53220645 is about 7295.2481109281. The cubic root of 53220645 is about 376.1491151615.

The spelling of 53220645 in words is "fifty-three million, two hundred twenty thousand, six hundred forty-five".