53778667 has 4 divisors (see below), whose sum is σ = 56942136. Its totient is φ = 50615200.

The previous prime is 53778661. The next prime is 53778671. The reversal of 53778667 is 76687735.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 53778667 - 2¹⁹ = 53254379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53778667.

It is not an unprimeable number, because it can be changed into a prime (53778661) 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, 1581709 + ... + 1581742.

It is an arithmetic number, because the mean of its divisors is an integer number (14235534).

Almost surely, 2^53778667 is an apocalyptic number.

53778667 is a deficient number, since it is larger than the sum of its proper divisors (3163469).

53778667 is a wasteful number, since it uses less digits than its factorization.

53778667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163468.

The product of its digits is 1481760, while the sum is 49.

The square root of 53778667 is about 7333.3939618706. The cubic root of 53778667 is about 377.4591965020.

It can be divided in two parts, 53778 and 667, that added together give a palindrome (54445).

The spelling of 53778667 in words is "fifty-three million, seven hundred seventy-eight thousand, six hundred sixty-seven".