64071540 has 96 divisors (see below), whose sum is σ = 214690560. Its totient is φ = 15769728.

The previous prime is 64071517. The next prime is 64071559. The reversal of 64071540 is 4517046.

64071540 = 232³ + 233³ + ... + 236³.

64071540 is a `hidden beast` number, since 640 + 7 + 15 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2457 + ... + 11583.

It is an arithmetic number, because the mean of its divisors is an integer number (2236360).

Almost surely, 2^64071540 is an apocalyptic number.

64071540 is a gapful number since it is divisible by the number (60) 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 64071540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107345280).

64071540 is an abundant number, since it is smaller than the sum of its proper divisors (150619020).

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

64071540 is a wasteful number, since it uses less digits than its factorization.

64071540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9158 (or 9150 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 64071540 is about 8004.4700011931. The cubic root of 64071540 is about 400.1489861676.

Adding to 64071540 its reverse (4517046), we get a palindrome (68588586).

The spelling of 64071540 in words is "sixty-four million, seventy-one thousand, five hundred forty".