7664720 has 40 divisors (see below), whose sum is σ = 20367744. Its totient is φ = 2627712.

The previous prime is 7664717. The next prime is 7664737. The reversal of 7664720 is 274667.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6284 + ... + 7403.

Almost surely, 2^7664720 is an apocalyptic number.

7664720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7664720 is an abundant number, since it is smaller than the sum of its proper divisors (12703024).

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

7664720 is a wasteful number, since it uses less digits than its factorization.

7664720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13707 (or 13701 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 7664720 is about 2768.5230719645. The cubic root of 7664720 is about 197.1660328222.

It can be divided in two parts, 76647 and 20, that added together give a palindrome (76667).

The spelling of 7664720 in words is "seven million, six hundred sixty-four thousand, seven hundred twenty".