64531440120 has 64 divisors (see below), whose sum is σ = 221250654720. Its totient is φ = 14750043264.

The previous prime is 64531440119. The next prime is 64531440137. The reversal of 64531440120 is 2104413546.

It is a super-2 number, since 2×64531440120² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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, 38410732 + ... + 38412411.

It is an arithmetic number, because the mean of its divisors is an integer number (3457041480).

Almost surely, 2^64531440120 is an apocalyptic number.

64531440120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64531440120 is an abundant number, since it is smaller than the sum of its proper divisors (156719214600).

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

64531440120 is a wasteful number, since it uses less digits than its factorization.

64531440120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76823164 (or 76823160 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 64531440120 its reverse (2104413546), we get a palindrome (66635853666).

The spelling of 64531440120 in words is "sixty-four billion, five hundred thirty-one million, four hundred forty thousand, one hundred twenty".