64440680487 has 4 divisors (see below), whose sum is σ = 85920907320. Its totient is φ = 42960453656.

The previous prime is 64440680483. The next prime is 64440680527. The reversal of 64440680487 is 78408604446.

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 64440680487 - 2² = 64440680483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440680483) 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, 10740113412 + ... + 10740113417.

It is an arithmetic number, because the mean of its divisors is an integer number (21480226830).

Almost surely, 2^64440680487 is an apocalyptic number.

64440680487 is a deficient number, since it is larger than the sum of its proper divisors (21480226833).

64440680487 is a wasteful number, since it uses less digits than its factorization.

64440680487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21480226832.

The product of its (nonzero) digits is 4128768, while the sum is 51.

The spelling of 64440680487 in words is "sixty-four billion, four hundred forty million, six hundred eighty thousand, four hundred eighty-seven".