64442308 has 48 divisors (see below), whose sum is σ = 140192640. Its totient is φ = 25284096.

The previous prime is 64442303. The next prime is 64442309. The reversal of 64442308 is 80324446.

It is a super-2 number, since 2×64442308² = 8305622120733728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64442308.

It is not an unprimeable number, because it can be changed into a prime (64442303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15783 + ... + 19441.

It is an arithmetic number, because the mean of its divisors is an integer number (2920680).

Almost surely, 2^64442308 is an apocalyptic number.

64442308 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64442308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70096320).

64442308 is an abundant number, since it is smaller than the sum of its proper divisors (75750332).

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

64442308 is a wasteful number, since it uses less digits than its factorization.

64442308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3724 (or 3722 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 64442308 is about 8027.5966515514. The cubic root of 64442308 is about 400.9193603226.

The spelling of 64442308 in words is "sixty-four million, four hundred forty-two thousand, three hundred eight".