54787681 has 4 divisors (see below), whose sum is σ = 59002132. Its totient is φ = 50573232.

The previous prime is 54787669. The next prime is 54787687. The reversal of 54787681 is 18678745.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22240656 + 32547025 = 4716^2 + 5705^2 .

It is a cyclic number.

It is not a de Polignac number, because 54787681 - 2⁹ = 54787169 is a prime.

It is a super-2 number, since 2×54787681² = 6003379978715522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54787687) 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, 2107206 + ... + 2107231.

It is an arithmetic number, because the mean of its divisors is an integer number (14750533).

Almost surely, 2^54787681 is an apocalyptic number.

It is an amenable number.

54787681 is a deficient number, since it is larger than the sum of its proper divisors (4214451).

54787681 is a wasteful number, since it uses less digits than its factorization.

54787681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4214450.

The product of its digits is 376320, while the sum is 46.

The square root of 54787681 is about 7401.8701015352. The cubic root of 54787681 is about 379.8052580183.

The spelling of 54787681 in words is "fifty-four million, seven hundred eighty-seven thousand, six hundred eighty-one".