287978731 has 2 divisors, whose sum is σ = 287978732. Its totient is φ = 287978730.

The previous prime is 287978689. The next prime is 287978773. The reversal of 287978731 is 137879782.

It is a balanced prime because it is at equal distance from previous prime (287978689) and next prime (287978773).

It is a cyclic number.

It is not a de Polignac number, because 287978731 - 2¹¹ = 287976683 is a prime.

It is a super-2 number, since 2×287978731² = 165863499016740722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (287970731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143989365 + 143989366.

It is an arithmetic number, because the mean of its divisors is an integer number (143989366).

Almost surely, 2^287978731 is an apocalyptic number.

287978731 is a deficient number, since it is larger than the sum of its proper divisors (1).

287978731 is an equidigital number, since it uses as much as digits as its factorization.

287978731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 52.

The square root of 287978731 is about 16969.9360929851. The cubic root of 287978731 is about 660.3691927374.

The spelling of 287978731 in words is "two hundred eighty-seven million, nine hundred seventy-eight thousand, seven hundred thirty-one".