64537482240 has 1760 divisors, whose sum is σ = 301314207744. Its totient is φ = 12819824640.

The previous prime is 64537482223. The next prime is 64537482299. The reversal of 64537482240 is 4228473546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (1760).

It is a super-2 number, since 2×64537482240² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1373137897 + ... + 1373137943.

Almost surely, 2^64537482240 is an apocalyptic number.

64537482240 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 64537482240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150657103872).

64537482240 is an abundant number, since it is smaller than the sum of its proper divisors (236776725504).

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

64537482240 is a wasteful number, since it uses less digits than its factorization.

64537482240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 45.

The spelling of 64537482240 in words is "sixty-four billion, five hundred thirty-seven million, four hundred eighty-two thousand, two hundred forty".