64442628 has 72 divisors (see below), whose sum is σ = 170369472. Its totient is φ = 21298464.

The previous prime is 64442561. The next prime is 64442633. The reversal of 64442628 is 82624446.

It is a happy number.

64442628 is a `hidden beast` number, since 644 + 4 + 2 + 6 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 64442592 and 64442601.

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, 162126 + ... + 162522.

Almost surely, 2^64442628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64442628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85184736).

64442628 is an abundant number, since it is smaller than the sum of its proper divisors (105926844).

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

64442628 is a wasteful number, since it uses less digits than its factorization.

64442628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 569 counting only the distinct ones).

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

The square root of 64442628 is about 8027.6165827722. The cubic root of 64442628 is about 400.9200239342.

The spelling of 64442628 in words is "sixty-four million, four hundred forty-two thousand, six hundred twenty-eight".