52405781 has 16 divisors (see below), whose sum is σ = 59097600. Its totient is φ = 46176768.

The previous prime is 52405757. The next prime is 52405807. The reversal of 52405781 is 18750425.

It is a cyclic number.

It is not a de Polignac number, because 52405781 - 2¹⁴ = 52389397 is a prime.

It is a super-2 number, since 2×52405781² = 5492731764439922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52405741) 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, 27836 + ... + 29658.

It is an arithmetic number, because the mean of its divisors is an integer number (3693600).

Almost surely, 2^52405781 is an apocalyptic number.

It is an amenable number.

52405781 is a deficient number, since it is larger than the sum of its proper divisors (6691819).

52405781 is a wasteful number, since it uses less digits than its factorization.

52405781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 52405781 is about 7239.1837247027. The cubic root of 52405781 is about 374.2194871113.

The spelling of 52405781 in words is "fifty-two million, four hundred five thousand, seven hundred eighty-one".