53778505 has 8 divisors (see below), whose sum is σ = 70401024. Its totient is φ = 39111600.

The previous prime is 53778469. The next prime is 53778523. The reversal of 53778505 is 50587735.

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

It is not a de Polignac number, because 53778505 - 2⁷ = 53778377 is a prime.

It is a Duffinian 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, 488841 + ... + 488950.

It is an arithmetic number, because the mean of its divisors is an integer number (8800128).

Almost surely, 2^53778505 is an apocalyptic number.

53778505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

53778505 is a deficient number, since it is larger than the sum of its proper divisors (16622519).

53778505 is a wasteful number, since it uses less digits than its factorization.

53778505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977807.

The product of its (nonzero) digits is 147000, while the sum is 40.

The square root of 53778505 is about 7333.3829164990. The cubic root of 53778505 is about 377.4588174889.

The spelling of 53778505 in words is "fifty-three million, seven hundred seventy-eight thousand, five hundred five".