65123987 has 4 divisors (see below), whose sum is σ = 65151456. Its totient is φ = 65096520.

The previous prime is 65123977. The next prime is 65124011. The reversal of 65123987 is 78932156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65123987 - 2¹⁰ = 65122963 is a prime.

It is a super-2 number, since 2×65123987² = 8482267365552338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65123917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9803 + ... + 15044.

It is an arithmetic number, because the mean of its divisors is an integer number (16287864).

Almost surely, 2^65123987 is an apocalyptic number.

65123987 is a deficient number, since it is larger than the sum of its proper divisors (27469).

65123987 is a wasteful number, since it uses less digits than its factorization.

65123987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27468.

The product of its digits is 90720, while the sum is 41.

The square root of 65123987 is about 8069.9434322677. The cubic root of 65123987 is about 402.3280635959.

The spelling of 65123987 in words is "sixty-five million, one hundred twenty-three thousand, nine hundred eighty-seven".