54640687 has 2 divisors, whose sum is σ = 54640688. Its totient is φ = 54640686.

The previous prime is 54640681. The next prime is 54640739. The reversal of 54640687 is 78604645.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 54640687 - 2⁷ = 54640559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54640681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27320343 + 27320344.

It is an arithmetic number, because the mean of its divisors is an integer number (27320344).

Almost surely, 2^54640687 is an apocalyptic number.

54640687 is a deficient number, since it is larger than the sum of its proper divisors (1).

54640687 is an equidigital number, since it uses as much as digits as its factorization.

54640687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 54640687 is about 7391.9339147479. The cubic root of 54640687 is about 379.4652844026.

The spelling of 54640687 in words is "fifty-four million, six hundred forty thousand, six hundred eighty-seven".