53665974 has 48 divisors (see below), whose sum is σ = 124658352. Its totient is φ = 16625664.

The previous prime is 53665973. The next prime is 53665981. The reversal of 53665974 is 47956635.

53665974 is a `hidden beast` number, since 53 + 6 + 6 + 597 + 4 = 666.

53665974 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53665973) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 24342 + ... + 26454.

It is an arithmetic number, because the mean of its divisors is an integer number (2597049).

Almost surely, 2^53665974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53665974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62329176).

53665974 is an abundant number, since it is smaller than the sum of its proper divisors (70992378).

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

53665974 is a wasteful number, since it uses less digits than its factorization.

53665974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221 (or 2218 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The square root of 53665974 is about 7325.7063823225. The cubic root of 53665974 is about 377.1953573362.

The spelling of 53665974 in words is "fifty-three million, six hundred sixty-five thousand, nine hundred seventy-four".