52778439 has 64 divisors (see below), whose sum is σ = 94080000. Its totient is φ = 29211840.

The previous prime is 52778437. The next prime is 52778443. The reversal of 52778439 is 93487725.

It is not a de Polignac number, because 52778439 - 2¹ = 52778437 is a prime.

Its product of digits (423360) is a multiple of the sum of its prime factors (210).

It is a junction number, because it is equal to n+sod(n) for n = 52778394 and 52778403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52778431) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 379632 + ... + 379770.

It is an arithmetic number, because the mean of its divisors is an integer number (1470000).

Almost surely, 2^52778439 is an apocalyptic number.

52778439 is a deficient number, since it is larger than the sum of its proper divisors (41301561).

52778439 is a wasteful number, since it uses less digits than its factorization.

52778439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 190 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 52778439 is about 7264.8770808597. The cubic root of 52778439 is about 375.1044189218.

The spelling of 52778439 in words is "fifty-two million, seven hundred seventy-eight thousand, four hundred thirty-nine".