64530040 has 32 divisors (see below), whose sum is σ = 145450080. Its totient is φ = 25766272.

The previous prime is 64530031. The next prime is 64530047. The reversal of 64530040 is 4003546.

64530040 is nontrivially palindromic in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 64529993 and 64530020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64530047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29877 + ... + 31963.

It is an arithmetic number, because the mean of its divisors is an integer number (4545315).

Almost surely, 2^64530040 is an apocalyptic number.

It is an amenable number.

64530040 is an abundant number, since it is smaller than the sum of its proper divisors (80920040).

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

64530040 is a wasteful number, since it uses less digits than its factorization.

64530040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2871 (or 2867 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 64530040 is about 8033.0591931094. The cubic root of 64530040 is about 401.1012155288.

Adding to 64530040 its reverse (4003546), we get a palindrome (68533586).

The spelling of 64530040 in words is "sixty-four million, five hundred thirty thousand, forty".