64101440 has 112 divisors (see below), whose sum is σ = 173248320. Its totient is φ = 22394880.

The previous prime is 64101431. The next prime is 64101487. The reversal of 64101440 is 4410146.

It is a happy number.

It is a super-2 number, since 2×64101440² = 8217989220147200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78635 + ... + 79445.

It is an arithmetic number, because the mean of its divisors is an integer number (1546860).

Almost surely, 2^64101440 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 64101440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86624160).

64101440 is an abundant number, since it is smaller than the sum of its proper divisors (109146880).

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

64101440 is a wasteful number, since it uses less digits than its factorization.

64101440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 64101440 is about 8006.3374897640. The cubic root of 64101440 is about 400.2112217771.

Adding to 64101440 its reverse (4410146), we get a palindrome (68511586).

The spelling of 64101440 in words is "sixty-four million, one hundred one thousand, four hundred forty".