64405506 has 32 divisors (see below), whose sum is σ = 143954496. Its totient is φ = 19040000.

The previous prime is 64405489. The next prime is 64405513. The reversal of 64405506 is 60550446.

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, 9195 + ... + 14606.

It is an arithmetic number, because the mean of its divisors is an integer number (4498578).

Almost surely, 2^64405506 is an apocalyptic number.

64405506 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64405506 is an abundant number, since it is smaller than the sum of its proper divisors (79548990).

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

64405506 is a wasteful number, since it uses less digits than its factorization.

64405506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23858.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 64405506 is about 8025.3041063875. The cubic root of 64405506 is about 400.8430261856.

The spelling of 64405506 in words is "sixty-four million, four hundred five thousand, five hundred six".