64642446 has 48 divisors (see below), whose sum is σ = 160842240. Its totient is φ = 18556560.

The previous prime is 64642423. The next prime is 64642451. The reversal of 64642446 is 64424646.

It is a happy number.

64642446 is a `hidden beast` number, since 6 + 4 + 642 + 4 + 4 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64642446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4830 + ... + 12353.

It is an arithmetic number, because the mean of its divisors is an integer number (3350880).

Almost surely, 2^64642446 is an apocalyptic number.

64642446 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

64642446 is an abundant number, since it is smaller than the sum of its proper divisors (96199794).

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

64642446 is a wasteful number, since it uses less digits than its factorization.

64642446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17221 (or 17218 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

The square root of 64642446 is about 8040.0526117682. The cubic root of 64642446 is about 401.3339754947. Note that the first 3 decimals are identical.

The spelling of 64642446 in words is "sixty-four million, six hundred forty-two thousand, four hundred forty-six".