55767787 has 2 divisors, whose sum is σ = 55767788. Its totient is φ = 55767786.

The previous prime is 55767743. The next prime is 55767799. The reversal of 55767787 is 78776755.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55767787 - 2¹⁵ = 55735019 is a prime.

It is a super-2 number, since 2×55767787² = 6220092133754738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55767707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27883893 + 27883894.

It is an arithmetic number, because the mean of its divisors is an integer number (27883894).

Almost surely, 2^55767787 is an apocalyptic number.

55767787 is a deficient number, since it is larger than the sum of its proper divisors (1).

55767787 is an equidigital number, since it uses as much as digits as its factorization.

55767787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2881200, while the sum is 52.

The square root of 55767787 is about 7467.7832721632. The cubic root of 55767787 is about 382.0566854834.

The spelling of 55767787 in words is "fifty-five million, seven hundred sixty-seven thousand, seven hundred eighty-seven".