53721738 has 96 divisors (see below), whose sum is σ = 141177600. Its totient is φ = 15095808.

The previous prime is 53721727. The next prime is 53721757. The reversal of 53721738 is 83712735.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208906 + ... + 209162.

It is an arithmetic number, because the mean of its divisors is an integer number (1470600).

Almost surely, 2^53721738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53721738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70588800).

53721738 is an abundant number, since it is smaller than the sum of its proper divisors (87455862).

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

53721738 is a wasteful number, since it uses less digits than its factorization.

53721738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 348 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 53721738 is about 7329.5114434729. The cubic root of 53721738 is about 377.3259592747.

The spelling of 53721738 in words is "fifty-three million, seven hundred twenty-one thousand, seven hundred thirty-eight".