64840120 has 32 divisors (see below), whose sum is σ = 146175120. Its totient is φ = 25885440.

The previous prime is 64840109. The next prime is 64840123. The reversal of 64840120 is 2104846.

It is a super-2 number, since 2×64840120² = 8408482323228800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64840123) 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, 24460 + ... + 26980.

Almost surely, 2^64840120 is an apocalyptic number.

It is an amenable number.

64840120 is an abundant number, since it is smaller than the sum of its proper divisors (81335000).

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

64840120 is a wasteful number, since it uses less digits than its factorization.

64840120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3175 (or 3171 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 64840120 is about 8052.3363069360. The cubic root of 64840120 is about 401.7426469290.

Adding to 64840120 its reverse (2104846), we get a palindrome (66944966).

The spelling of 64840120 in words is "sixty-four million, eight hundred forty thousand, one hundred twenty".