53820247 has 12 divisors (see below), whose sum is σ = 60164544. Its totient is φ = 48072960.

The previous prime is 53820209. The next prime is 53820257. The reversal of 53820247 is 74202835.

It is a de Polignac number, because none of the positive numbers 2^k-53820247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53820257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103 + ... + 10375.

It is an arithmetic number, because the mean of its divisors is an integer number (5013712).

Almost surely, 2^53820247 is an apocalyptic number.

53820247 is a deficient number, since it is larger than the sum of its proper divisors (6344297).

53820247 is a wasteful number, since it uses less digits than its factorization.

53820247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10330 (or 10317 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 53820247 is about 7336.2283906651. The cubic root of 53820247 is about 377.5564513622.

The spelling of 53820247 in words is "fifty-three million, eight hundred twenty thousand, two hundred forty-seven".