64415540 has 24 divisors (see below), whose sum is σ = 154597632. Its totient is φ = 22085280.

The previous prime is 64415509. The next prime is 64415623. The reversal of 64415540 is 4551446.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229916 + ... + 230195.

It is an arithmetic number, because the mean of its divisors is an integer number (6441568).

Almost surely, 2^64415540 is an apocalyptic number.

It is an amenable number.

64415540 is an abundant number, since it is smaller than the sum of its proper divisors (90182092).

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

64415540 is a wasteful number, since it uses less digits than its factorization.

64415540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460127 (or 460125 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 64415540 is about 8025.9292296905. The cubic root of 64415540 is about 400.8638414353.

Adding to 64415540 its reverse (4551446), we get a palindrome (68966986).

The spelling of 64415540 in words is "sixty-four million, four hundred fifteen thousand, five hundred forty".