53720447 has 4 divisors (see below), whose sum is σ = 58604136. Its totient is φ = 48836760.

The previous prime is 53720437. The next prime is 53720449. The reversal of 53720447 is 74402735.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53720447 - 2²² = 49526143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53720449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2441828 + ... + 2441849.

It is an arithmetic number, because the mean of its divisors is an integer number (14651034).

Almost surely, 2^53720447 is an apocalyptic number.

53720447 is a deficient number, since it is larger than the sum of its proper divisors (4883689).

53720447 is a wasteful number, since it uses less digits than its factorization.

53720447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4883688.

The product of its (nonzero) digits is 23520, while the sum is 32.

The square root of 53720447 is about 7329.4233743181. The cubic root of 53720447 is about 377.3229367135.

The spelling of 53720447 in words is "fifty-three million, seven hundred twenty thousand, four hundred forty-seven".