52778391 has 16 divisors (see below), whose sum is σ = 73507200. Its totient is φ = 33650208.

The previous prime is 52778377. The next prime is 52778393. The reversal of 52778391 is 19387725.

It is not a de Polignac number, because 52778391 - 2¹³ = 52770199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52778393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2520 + ... + 10578.

It is an arithmetic number, because the mean of its divisors is an integer number (4594200).

Almost surely, 2^52778391 is an apocalyptic number.

52778391 is a deficient number, since it is larger than the sum of its proper divisors (20728809).

52778391 is a wasteful number, since it uses less digits than its factorization.

52778391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8158.

The product of its digits is 105840, while the sum is 42.

The square root of 52778391 is about 7264.8737772930. The cubic root of 52778391 is about 375.1043052073.

The spelling of 52778391 in words is "fifty-two million, seven hundred seventy-eight thousand, three hundred ninety-one".