7522640 has 20 divisors (see below), whose sum is σ = 17490324. Its totient is φ = 3009024.

The previous prime is 7522631. The next prime is 7522643. The reversal of 7522640 is 462257.

It can be written as a sum of positive squares in 2 ways, for example, as 3474496 + 4048144 = 1864^2 + 2012^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×7522640² = 113180225139200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 7⁸ + 5⁷ + 2 + 2⁵ + 6⁸ + 4³ + 0 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7522643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46937 + ... + 47096.

Almost surely, 2^7522640 is an apocalyptic number.

It is an amenable number.

7522640 is an abundant number, since it is smaller than the sum of its proper divisors (9967684).

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

7522640 is a wasteful number, since it uses less digits than its factorization.

7522640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94046 (or 94040 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 7522640 is about 2742.7431523932. The cubic root of 7522640 is about 195.9401455441.

Adding to 7522640 its reverse (462257), we get a palindrome (7984897).

The spelling of 7522640 in words is "seven million, five hundred twenty-two thousand, six hundred forty".