64041640 has 64 divisors (see below), whose sum is σ = 156764160. Its totient is φ = 23404800.

The previous prime is 64041623. The next prime is 64041673. The reversal of 64041640 is 4614046.

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, 55065 + ... + 56215.

It is an arithmetic number, because the mean of its divisors is an integer number (2449440).

Almost surely, 2^64041640 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 64041640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78382080).

64041640 is an abundant number, since it is smaller than the sum of its proper divisors (92722520).

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

64041640 is a wasteful number, since it uses less digits than its factorization.

64041640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282 (or 1278 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 64041640 is about 8002.6020768248. The cubic root of 64041640 is about 400.0867311929.

Adding to 64041640 its reverse (4614046), we get a palindrome (68655686).

The spelling of 64041640 in words is "sixty-four million, forty-one thousand, six hundred forty".