55990787 has 2 divisors, whose sum is σ = 55990788. Its totient is φ = 55990786.

The previous prime is 55990751. The next prime is 55990799. The reversal of 55990787 is 78709955.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55990787 - 2⁶ = 55990723 is a prime.

It is not a weakly prime, because it can be changed into another prime (55990747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27995393 + 27995394.

It is an arithmetic number, because the mean of its divisors is an integer number (27995394).

Almost surely, 2^55990787 is an apocalyptic number.

55990787 is a deficient number, since it is larger than the sum of its proper divisors (1).

55990787 is an equidigital number, since it uses as much as digits as its factorization.

55990787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 793800, while the sum is 50.

The square root of 55990787 is about 7482.6991787723. The cubic root of 55990787 is about 382.5652546479.

The spelling of 55990787 in words is "fifty-five million, nine hundred ninety thousand, seven hundred eighty-seven".