53990645 has 8 divisors (see below), whose sum is σ = 66369240. Its totient is φ = 42138880.

The previous prime is 53990641. The next prime is 53990669. The reversal of 53990645 is 54609935.

It can be written as a sum of positive squares in 4 ways, for example, as 6848689 + 47141956 = 2617^2 + 6866^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53990645 - 2² = 53990641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53990641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131480 + ... + 131889.

It is an arithmetic number, because the mean of its divisors is an integer number (8296155).

Almost surely, 2^53990645 is an apocalyptic number.

It is an amenable number.

53990645 is a deficient number, since it is larger than the sum of its proper divisors (12378595).

53990645 is a wasteful number, since it uses less digits than its factorization.

53990645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263415.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 53990645 is about 7347.8326736528. The cubic root of 53990645 is about 377.9544867423.

The spelling of 53990645 in words is "fifty-three million, nine hundred ninety thousand, six hundred forty-five".