64628244 has 18 divisors (see below), whose sum is σ = 163365930. Its totient is φ = 21542736.

The previous prime is 64628231. The next prime is 64628293. The reversal of 64628244 is 44282646.

It is a happy number.

64628244 is a `hidden beast` number, since 6 + 4 + 628 + 24 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 58064400 + 6563844 = 7620^2 + 2562^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1795229 = 64628244 / (6 + 4 + 6 + 2 + 8 + 2 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 64628199 and 64628208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 897579 + ... + 897650.

It is an arithmetic number, because the mean of its divisors is an integer number (9075885).

Almost surely, 2^64628244 is an apocalyptic number.

It is an amenable number.

64628244 is an abundant number, since it is smaller than the sum of its proper divisors (98737686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64628244 is a wasteful number, since it uses less digits than its factorization.

64628244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795239 (or 1795234 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

The square root of 64628244 is about 8039.1693600769. The cubic root of 64628244 is about 401.3045822042.

It can be divided in two parts, 6462 and 8244, that added together give a triangular number (14706 = T₁₇₁).

The spelling of 64628244 in words is "sixty-four million, six hundred twenty-eight thousand, two hundred forty-four".