64650687 has 4 divisors (see below), whose sum is σ = 86200920. Its totient is φ = 43100456.

The previous prime is 64650671. The next prime is 64650697. The reversal of 64650687 is 78605646.

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 64650687 - 2⁴ = 64650671 is a prime.

It is a super-2 number, since 2×64650687² = 8359422659143938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64650647) 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, 10775112 + ... + 10775117.

It is an arithmetic number, because the mean of its divisors is an integer number (21550230).

Almost surely, 2^64650687 is an apocalyptic number.

64650687 is a deficient number, since it is larger than the sum of its proper divisors (21550233).

64650687 is a wasteful number, since it uses less digits than its factorization.

64650687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21550232.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 64650687 is about 8040.5650920815. The cubic root of 64650687 is about 401.3510295769.

The spelling of 64650687 in words is "sixty-four million, six hundred fifty thousand, six hundred eighty-seven".