6915645440 has 112 divisors (see below), whose sum is σ = 18106491600. Its totient is φ = 2514616320.

The previous prime is 6915645421. The next prime is 6915645487. The reversal of 6915645440 is 445465196.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 6915645391 and 6915645400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442886 + ... + 458234.

Almost surely, 2^6915645440 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 6915645440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9053245800).

6915645440 is an abundant number, since it is smaller than the sum of its proper divisors (11190846160).

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

6915645440 is a wasteful number, since it uses less digits than its factorization.

6915645440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15391 (or 15367 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 6915645440 is about 83160.3597875815. The cubic root of 6915645440 is about 1905.2160863352.

The spelling of 6915645440 in words is "six billion, nine hundred fifteen million, six hundred forty-five thousand, four hundred forty".