53779840 has 64 divisors (see below), whose sum is σ = 136157760. Its totient is φ = 20242432.

The previous prime is 53779783. The next prime is 53779841. The reversal of 53779840 is 4897735.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53779841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8409 + ... + 13351.

It is an arithmetic number, because the mean of its divisors is an integer number (2127465).

Almost surely, 2^53779840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53779840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68078880).

53779840 is an abundant number, since it is smaller than the sum of its proper divisors (82377920).

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

53779840 is a wasteful number, since it uses less digits than its factorization.

53779840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4979 (or 4967 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 53779840 is about 7333.4739380460. The cubic root of 53779840 is about 377.4619408146.

The spelling of 53779840 in words is "fifty-three million, seven hundred seventy-nine thousand, eight hundred forty".