64642242 has 32 divisors (see below), whose sum is σ = 148137984. Its totient is φ = 18421200.

The previous prime is 64642241. The next prime is 64642243. The reversal of 64642242 is 24224646.

It is an interprime number because it is at equal distance from previous prime (64642241) and next prime (64642243).

It is not an unprimeable number, because it can be changed into a prime (64642241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16317 + ... + 19887.

It is an arithmetic number, because the mean of its divisors is an integer number (4629312).

Almost surely, 2^64642242 is an apocalyptic number.

64642242 is an abundant number, since it is smaller than the sum of its proper divisors (83495742).

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

64642242 is a wasteful number, since it uses less digits than its factorization.

64642242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014.

The product of its digits is 18432, while the sum is 30.

The square root of 64642242 is about 8040.0399252740. The cubic root of 64642242 is about 401.3335533148. Note that the first 3 decimals are identical.

Adding to 64642242 its reverse (24224646), we get a palindrome (88866888).

The spelling of 64642242 in words is "sixty-four million, six hundred forty-two thousand, two hundred forty-two".