53640990 has 144 divisors (see below), whose sum is σ = 159763968. Its totient is φ = 12410496.

The previous prime is 53640973. The next prime is 53641031. The reversal of 53640990 is 9904635.

53640990 is a `hidden beast` number, since 5 + 3 + 640 + 9 + 9 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 422307 + ... + 422433.

It is an arithmetic number, because the mean of its divisors is an integer number (1109472).

Almost surely, 2^53640990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53640990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79881984).

53640990 is an abundant number, since it is smaller than the sum of its proper divisors (106122978).

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

53640990 is a wasteful number, since it uses less digits than its factorization.

53640990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 53640990 is about 7324.0009557618. Note that the first 3 decimals coincide. The cubic root of 53640990 is about 377.1368142725.

The spelling of 53640990 in words is "fifty-three million, six hundred forty thousand, nine hundred ninety".