53778640 has 40 divisors (see below), whose sum is σ = 125349120. Its totient is φ = 21457536.

The previous prime is 53778631. The next prime is 53778661. The reversal of 53778640 is 4687735.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 53778593 and 53778602.

It is a congruent number.

It is an unprimeable number.

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, 51241 + ... + 52279.

It is an arithmetic number, because the mean of its divisors is an integer number (3133728).

Almost surely, 2^53778640 is an apocalyptic number.

It is an amenable number.

53778640 is an abundant number, since it is smaller than the sum of its proper divisors (71570480).

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

53778640 is a wasteful number, since it uses less digits than its factorization.

53778640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 53778640 is about 7333.3921209765. The cubic root of 53778640 is about 377.4591333332.

The spelling of 53778640 in words is "fifty-three million, seven hundred seventy-eight thousand, six hundred forty".