7155640 has 48 divisors (see below), whose sum is σ = 17130600. Its totient is φ = 2689536.

The previous prime is 7155611. The next prime is 7155649. The reversal of 7155640 is 465517.

It is a junction number, because it is equal to n+sod(n) for n = 7155599 and 7155608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7155649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11251 + ... + 11869.

Almost surely, 2^7155640 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 7155640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8565300).

7155640 is an abundant number, since it is smaller than the sum of its proper divisors (9974960).

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

7155640 is a wasteful number, since it uses less digits than its factorization.

7155640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 643 counting only the distinct ones).

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

The square root of 7155640 is about 2675.0028037368. The cubic root of 7155640 is about 192.7004938683.

The spelling of 7155640 in words is "seven million, one hundred fifty-five thousand, six hundred forty".