64428529687 has 4 divisors (see below), whose sum is σ = 68218443216. Its totient is φ = 60638616160.

The previous prime is 64428529663. The next prime is 64428529703. The reversal of 64428529687 is 78692582446.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64428529687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64428529387) 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, 1894956739 + ... + 1894956772.

It is an arithmetic number, because the mean of its divisors is an integer number (17054610804).

Almost surely, 2^64428529687 is an apocalyptic number.

64428529687 is a deficient number, since it is larger than the sum of its proper divisors (3789913529).

64428529687 is a wasteful number, since it uses less digits than its factorization.

64428529687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789913528.

The product of its digits is 46448640, while the sum is 61.

The spelling of 64428529687 in words is "sixty-four billion, four hundred twenty-eight million, five hundred twenty-nine thousand, six hundred eighty-seven".