55642787 has 2 divisors, whose sum is σ = 55642788. Its totient is φ = 55642786.

The previous prime is 55642759. The next prime is 55642801. The reversal of 55642787 is 78724655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55642787 - 2¹² = 55638691 is a prime.

It is a super-2 number, since 2×55642787² = 6192239490254738, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55642747) 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, 27821393 + 27821394.

It is an arithmetic number, because the mean of its divisors is an integer number (27821394).

Almost surely, 2^55642787 is an apocalyptic number.

55642787 is a deficient number, since it is larger than the sum of its proper divisors (1).

55642787 is an equidigital number, since it uses as much as digits as its factorization.

55642787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 470400, while the sum is 44.

The square root of 55642787 is about 7459.4092929668. The cubic root of 55642787 is about 381.7710199032.

The spelling of 55642787 in words is "fifty-five million, six hundred forty-two thousand, seven hundred eighty-seven".