53778516 has 48 divisors (see below), whose sum is σ = 138790848. Its totient is φ = 16070400.

The previous prime is 53778469. The next prime is 53778523. The reversal of 53778516 is 61587735.

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 15 ways as a sum of consecutive naturals, for example, 6846 + ... + 12426.

It is an arithmetic number, because the mean of its divisors is an integer number (2891476).

Almost surely, 2^53778516 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 53778516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69395424).

53778516 is an abundant number, since it is smaller than the sum of its proper divisors (85012332).

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

53778516 is a wasteful number, since it uses less digits than its factorization.

53778516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672 (or 5670 counting only the distinct ones).

The product of its digits is 176400, while the sum is 42.

The square root of 53778516 is about 7333.3836664939. The cubic root of 53778516 is about 377.4588432244.

The spelling of 53778516 in words is "fifty-three million, seven hundred seventy-eight thousand, five hundred sixteen".