53213644 has 24 divisors (see below), whose sum is σ = 101883600. Its totient is φ = 24118080.

The previous prime is 53213627. The next prime is 53213647. The reversal of 53213644 is 44631235.

It is not an unprimeable number, because it can be changed into a prime (53213647) 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, 15562 + ... + 18670.

It is an arithmetic number, because the mean of its divisors is an integer number (4245150).

Almost surely, 2^53213644 is an apocalyptic number.

It is an amenable number.

53213644 is a deficient number, since it is larger than the sum of its proper divisors (48669956).

53213644 is a wasteful number, since it uses less digits than its factorization.

53213644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3513 (or 3511 counting only the distinct ones).

The product of its digits is 8640, while the sum is 28.

The square root of 53213644 is about 7294.7682622548. The cubic root of 53213644 is about 376.1326207138.

Adding to 53213644 its reverse (44631235), we get a palindrome (97844879).

The spelling of 53213644 in words is "fifty-three million, two hundred thirteen thousand, six hundred forty-four".