53477721 has 12 divisors (see below), whose sum is σ = 84268080. Its totient is φ = 32410680.

The previous prime is 53477719. The next prime is 53477729. The reversal of 53477721 is 12777435.

It is not a de Polignac number, because 53477721 - 2¹ = 53477719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53477729) 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, 269991 + ... + 270188.

It is an arithmetic number, because the mean of its divisors is an integer number (7022340).

Almost surely, 2^53477721 is an apocalyptic number.

It is an amenable number.

53477721 is a deficient number, since it is larger than the sum of its proper divisors (30790359).

53477721 is a wasteful number, since it uses less digits than its factorization.

53477721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540196 (or 540193 counting only the distinct ones).

The product of its digits is 41160, while the sum is 36.

The square root of 53477721 is about 7312.8462994924. The cubic root of 53477721 is about 376.7537904643.

It can be divided in two parts, 53 and 477721, that added together give a palindrome (477774).

The spelling of 53477721 in words is "fifty-three million, four hundred seventy-seven thousand, seven hundred twenty-one".