7515640 has 128 divisors (see below), whose sum is σ = 20736000. Its totient is φ = 2419200.

The previous prime is 7515637. The next prime is 7515647. The reversal of 7515640 is 465157.

It is a junction number, because it is equal to n+sod(n) for n = 7515599 and 7515608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7515647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242425 + ... + 242455.

It is an arithmetic number, because the mean of its divisors is an integer number (162000).

Almost surely, 2^7515640 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 7515640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10368000).

7515640 is an abundant number, since it is smaller than the sum of its proper divisors (13220360).

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

7515640 is a wasteful number, since it uses less digits than its factorization.

7515640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 7515640 is about 2741.4667606958. The cubic root of 7515640 is about 195.8793509885.

The spelling of 7515640 in words is "seven million, five hundred fifteen thousand, six hundred forty".