18928478287 has 2 divisors, whose sum is σ = 18928478288. Its totient is φ = 18928478286.

The previous prime is 18928478251. The next prime is 18928478297. The reversal of 18928478287 is 78287482981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18928478287 - 2¹⁹ = 18927953999 is a prime.

It is a super-2 number, since 2×18928478287² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18928478207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9464239143 + 9464239144.

It is an arithmetic number, because the mean of its divisors is an integer number (9464239144).

Almost surely, 2^18928478287 is an apocalyptic number.

18928478287 is a deficient number, since it is larger than the sum of its proper divisors (1).

18928478287 is an equidigital number, since it uses as much as digits as its factorization.

18928478287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28901376, while the sum is 64.

The spelling of 18928478287 in words is "eighteen billion, nine hundred twenty-eight million, four hundred seventy-eight thousand, two hundred eighty-seven".