53721240 has 32 divisors (see below), whose sum is σ = 161164080. Its totient is φ = 14325632.

The previous prime is 53721229. The next prime is 53721251. The reversal of 53721240 is 4212735.

53721240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (53721229) and next prime (53721251).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 53721240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223719 + ... + 223958.

Almost surely, 2^53721240 is an apocalyptic number.

It is an amenable number.

53721240 is an abundant number, since it is smaller than the sum of its proper divisors (107442840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

53721240 is a wasteful number, since it uses less digits than its factorization.

53721240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447691 (or 447687 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 53721240 is about 7329.4774711435. The cubic root of 53721240 is about 377.3247933350.

Adding to 53721240 its reverse (4212735), we get a palindrome (57933975).

The spelling of 53721240 in words is "fifty-three million, seven hundred twenty-one thousand, two hundred forty".