64277645 has 4 divisors (see below), whose sum is σ = 77133180. Its totient is φ = 51422112.

The previous prime is 64277641. The next prime is 64277657. The reversal of 64277645 is 54677246.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14969161 + 49308484 = 3869^2 + 7022^2 .

It is a cyclic number.

It is not a de Polignac number, because 64277645 - 2² = 64277641 is a prime.

It is a super-3 number, since 3×64277645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64277641) 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, 6427760 + ... + 6427769.

It is an arithmetic number, because the mean of its divisors is an integer number (19283295).

Almost surely, 2^64277645 is an apocalyptic number.

It is an amenable number.

64277645 is a deficient number, since it is larger than the sum of its proper divisors (12855535).

64277645 is a wasteful number, since it uses less digits than its factorization.

64277645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12855534.

The product of its digits is 282240, while the sum is 41.

The square root of 64277645 is about 8017.3340332058. The cubic root of 64277645 is about 400.5775926487.

It can be divided in two parts, 642 and 77645, that added together give a palindrome (78287).

The spelling of 64277645 in words is "sixty-four million, two hundred seventy-seven thousand, six hundred forty-five".