52782781 has 4 divisors (see below), whose sum is σ = 52812864. Its totient is φ = 52752700.

The previous prime is 52782767. The next prime is 52782799. The reversal of 52782781 is 18728725.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52782781 - 2²³ = 44394173 is a prime.

It is a super-2 number, since 2×52782781² = 5572043940187922, 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 (52782731) 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, 12235 + ... + 15976.

It is an arithmetic number, because the mean of its divisors is an integer number (13203216).

Almost surely, 2^52782781 is an apocalyptic number.

It is an amenable number.

52782781 is a deficient number, since it is larger than the sum of its proper divisors (30083).

52782781 is a wasteful number, since it uses less digits than its factorization.

52782781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30082.

The product of its digits is 62720, while the sum is 40.

The square root of 52782781 is about 7265.1759097767. The cubic root of 52782781 is about 375.1147050586.

The spelling of 52782781 in words is "fifty-two million, seven hundred eighty-two thousand, seven hundred eighty-one".