64380240 has 60 divisors (see below), whose sum is σ = 216212724. Its totient is φ = 17167872.

The previous prime is 64380229. The next prime is 64380247. The reversal of 64380240 is 4208346.

It can be written as a sum of positive squares in 2 ways, for example, as 50808384 + 13571856 = 7128^2 + 3684^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64380247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43989 + ... + 45428.

Almost surely, 2^64380240 is an apocalyptic number.

64380240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64380240 is an abundant number, since it is smaller than the sum of its proper divisors (151832484).

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

64380240 is a wasteful number, since it uses less digits than its factorization.

64380240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89436 (or 89427 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 64380240 is about 8023.7298060191. The cubic root of 64380240 is about 400.7906030044.

Adding to 64380240 its reverse (4208346), we get a palindrome (68588586).

It can be divided in two parts, 64380 and 240, that added together give a triangular number (64620 = T₃₅₉).

The spelling of 64380240 in words is "sixty-four million, three hundred eighty thousand, two hundred forty".