264865987 has 2 divisors, whose sum is σ = 264865988. Its totient is φ = 264865986.

The previous prime is 264865957. The next prime is 264866033. The reversal of 264865987 is 789568462.

264865987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 264865987 - 2⁷ = 264865859 is a prime.

It is not a weakly prime, because it can be changed into another prime (264865957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132432993 + 132432994.

It is an arithmetic number, because the mean of its divisors is an integer number (132432994).

Almost surely, 2^264865987 is an apocalyptic number.

264865987 is a deficient number, since it is larger than the sum of its proper divisors (1).

264865987 is an equidigital number, since it uses as much as digits as its factorization.

264865987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 55.

The square root of 264865987 is about 16274.7038989961. The cubic root of 264865987 is about 642.2075355411.

It can be divided in two parts, 2648 and 65987, that added together give a triangular number (68635 = T₃₇₀).

The spelling of 264865987 in words is "two hundred sixty-four million, eight hundred sixty-five thousand, nine hundred eighty-seven".