53550729 has 12 divisors (see below), whose sum is σ = 79442116. Its totient is φ = 34735392.

The previous prime is 53550727. The next prime is 53550767. The reversal of 53550729 is 92705535.

53550729 is a `hidden beast` number, since 535 + 50 + 72 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22581504 + 30969225 = 4752^2 + 5565^2 .

It is not a de Polignac number, because 53550729 - 2¹ = 53550727 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 53550693 and 53550702.

It is not an unprimeable number, because it can be changed into a prime (53550727) 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, 80074 + ... + 80739.

Almost surely, 2^53550729 is an apocalyptic number.

It is an amenable number.

53550729 is a deficient number, since it is larger than the sum of its proper divisors (25891387).

53550729 is a wasteful number, since it uses less digits than its factorization.

53550729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160856 (or 160853 counting only the distinct ones).

The product of its (nonzero) digits is 47250, while the sum is 36.

The square root of 53550729 is about 7317.8363605645. The cubic root of 53550729 is about 376.9251610998.

The spelling of 53550729 in words is "fifty-three million, five hundred fifty thousand, seven hundred twenty-nine".