65398987 has 4 divisors (see below), whose sum is σ = 65692480. Its totient is φ = 65105496.

The previous prime is 65398967. The next prime is 65398997. The reversal of 65398987 is 78989356.

It is a happy number.

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 65398987 - 2⁷ = 65398859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65398967) 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, 146412 + ... + 146857.

It is an arithmetic number, because the mean of its divisors is an integer number (16423120).

Almost surely, 2^65398987 is an apocalyptic number.

65398987 is a deficient number, since it is larger than the sum of its proper divisors (293493).

65398987 is a wasteful number, since it uses less digits than its factorization.

65398987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293492.

The product of its digits is 3265920, while the sum is 55.

The square root of 65398987 is about 8086.9640162424. The cubic root of 65398987 is about 402.8935738525.

The spelling of 65398987 in words is "sixty-five million, three hundred ninety-eight thousand, nine hundred eighty-seven".