7640424 has 72 divisors (see below), whose sum is σ = 22770930. Its totient is φ = 2312640.

The previous prime is 7640419. The next prime is 7640443. The reversal of 7640424 is 4240467.

It can be written as a sum of positive squares in only one way, i.e., 5336100 + 2304324 = 2310^2 + 1518^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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 17 ways as a sum of consecutive naturals, for example, 8274 + ... + 9150.

Almost surely, 2^7640424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7640424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11385465).

7640424 is an abundant number, since it is smaller than the sum of its proper divisors (15130506).

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

7640424 is a wasteful number, since it uses less digits than its factorization.

7640424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 7640424 is about 2764.1316900611. The cubic root of 7640424 is about 196.9574835026.

The spelling of 7640424 in words is "seven million, six hundred forty thousand, four hundred twenty-four".