64331628 has 48 divisors (see below), whose sum is σ = 156008160. Its totient is φ = 20608000.

The previous prime is 64331627. The next prime is 64331629. The reversal of 64331628 is 82613346.

It is an interprime number because it is at equal distance from previous prime (64331627) and next prime (64331629).

It is a super-2 number, since 2×64331628² = 8277116722260768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64331623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139318 + ... + 139778.

It is an arithmetic number, because the mean of its divisors is an integer number (3250170).

Almost surely, 2^64331628 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 64331628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78004080).

64331628 is an abundant number, since it is smaller than the sum of its proper divisors (91676532).

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

64331628 is a wasteful number, since it uses less digits than its factorization.

64331628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898 (or 896 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 64331628 is about 8020.6999694540. The cubic root of 64331628 is about 400.6897017619.

The spelling of 64331628 in words is "sixty-four million, three hundred thirty-one thousand, six hundred twenty-eight".