64677645 has 24 divisors (see below), whose sum is σ = 112320000. Its totient is φ = 34429536.

The previous prime is 64677637. The next prime is 64677659. The reversal of 64677645 is 54677646.

It is a happy number.

It is not a de Polignac number, because 64677645 - 2³ = 64677637 is a prime.

It is a super-3 number, since 3×64677645³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 64677645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31356 + ... + 33354.

It is an arithmetic number, because the mean of its divisors is an integer number (4680000).

Almost surely, 2^64677645 is an apocalyptic number.

It is an amenable number.

64677645 is a deficient number, since it is larger than the sum of its proper divisors (47642355).

64677645 is a wasteful number, since it uses less digits than its factorization.

64677645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2729 (or 2726 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 64677645 is about 8042.2412920777. The cubic root of 64677645 is about 401.4068068524.

Subtracting from 64677645 its reverse (54677646), we obtain a palindrome (9999999).

The spelling of 64677645 in words is "sixty-four million, six hundred seventy-seven thousand, six hundred forty-five".