6440285987 has 4 divisors (see below), whose sum is σ = 6440857656. Its totient is φ = 6439714320.

The previous prime is 6440285977. The next prime is 6440285989. The reversal of 6440285987 is 7895820446.

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 6440285987 - 2¹² = 6440281891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6440285989) 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, 268589 + ... + 291582.

It is an arithmetic number, because the mean of its divisors is an integer number (1610214414).

Almost surely, 2^6440285987 is an apocalyptic number.

6440285987 is a deficient number, since it is larger than the sum of its proper divisors (571669).

6440285987 is a wasteful number, since it uses less digits than its factorization.

6440285987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571668.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The square root of 6440285987 is about 80251.3924302875. The cubic root of 6440285987 is about 1860.5230335269.

The spelling of 6440285987 in words is "six billion, four hundred forty million, two hundred eighty-five thousand, nine hundred eighty-seven".