55287907 has 2 divisors, whose sum is σ = 55287908. Its totient is φ = 55287906.

The previous prime is 55287901. The next prime is 55287943. The reversal of 55287907 is 70978255.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55287907 is a prime.

It is not a weakly prime, because it can be changed into another prime (55287901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27643953 + 27643954.

It is an arithmetic number, because the mean of its divisors is an integer number (27643954).

Almost surely, 2^55287907 is an apocalyptic number.

55287907 is a deficient number, since it is larger than the sum of its proper divisors (1).

55287907 is an equidigital number, since it uses as much as digits as its factorization.

55287907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 55287907 is about 7435.5838371980. The cubic root of 55287907 is about 380.9576652856.

The spelling of 55287907 in words is "fifty-five million, two hundred eighty-seven thousand, nine hundred seven".