53778365 has 4 divisors (see below), whose sum is σ = 64534044. Its totient is φ = 43022688.

The previous prime is 53778349. The next prime is 53778367. The reversal of 53778365 is 56387735.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56387735 = 5 ⋅11277547.

It can be written as a sum of positive squares in 2 ways, for example, as 19882681 + 33895684 = 4459^2 + 5822^2 .

It is a cyclic number.

It is not a de Polignac number, because 53778365 - 2⁴ = 53778349 is a prime.

It is a super-2 number, since 2×53778365² = 5784225084146450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53778367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5377832 + ... + 5377841.

It is an arithmetic number, because the mean of its divisors is an integer number (16133511).

Almost surely, 2^53778365 is an apocalyptic number.

It is an amenable number.

53778365 is a deficient number, since it is larger than the sum of its proper divisors (10755679).

53778365 is a wasteful number, since it uses less digits than its factorization.

53778365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10755678.

The product of its digits is 529200, while the sum is 44.

The square root of 53778365 is about 7333.3733711028. The cubic root of 53778365 is about 377.4584899462.

The spelling of 53778365 in words is "fifty-three million, seven hundred seventy-eight thousand, three hundred sixty-five".