52787681 has 4 divisors (see below), whose sum is σ = 55566000. Its totient is φ = 50009364.

The previous prime is 52787659. The next prime is 52787717. The reversal of 52787681 is 18678725.

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 a de Polignac number, because none of the positive numbers 2^k-52787681 is a prime.

It is a super-2 number, since 2×52787681² = 5573078530715522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52787621) 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, 1389131 + ... + 1389168.

It is an arithmetic number, because the mean of its divisors is an integer number (13891500).

Almost surely, 2^52787681 is an apocalyptic number.

It is an amenable number.

52787681 is a deficient number, since it is larger than the sum of its proper divisors (2778319).

52787681 is a wasteful number, since it uses less digits than its factorization.

52787681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778318.

The product of its digits is 188160, while the sum is 44.

The square root of 52787681 is about 7265.5131270957. The cubic root of 52787681 is about 375.1263124120.

The spelling of 52787681 in words is "fifty-two million, seven hundred eighty-seven thousand, six hundred eighty-one".