65678987 has 16 divisors (see below), whose sum is σ = 74732544. Its totient is φ = 57180000.

The previous prime is 65678983. The next prime is 65678993. The reversal of 65678987 is 78987656.

It is a happy number.

65678987 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a cyclic number.

It is not a de Polignac number, because 65678987 - 2² = 65678983 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65678983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33488 + ... + 35394.

It is an arithmetic number, because the mean of its divisors is an integer number (4670784).

Almost surely, 2^65678987 is an apocalyptic number.

65678987 is a deficient number, since it is larger than the sum of its proper divisors (9053557).

65678987 is a wasteful number, since it uses less digits than its factorization.

65678987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050.

The product of its digits is 5080320, while the sum is 56.

The square root of 65678987 is about 8104.2573379675. The cubic root of 65678987 is about 403.4677396617.

The spelling of 65678987 in words is "sixty-five million, six hundred seventy-eight thousand, nine hundred eighty-seven".