7881615 has 48 divisors (see below), whose sum is σ = 15814656. Its totient is φ = 3556800.

The previous prime is 7881613. The next prime is 7881619. The reversal of 7881615 is 5161887.

It is not a de Polignac number, because 7881615 - 2¹ = 7881613 is a prime.

7881615 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7881615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41170 + ... + 41360.

It is an arithmetic number, because the mean of its divisors is an integer number (329472).

Almost surely, 2^7881615 is an apocalyptic number.

7881615 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

7881615 is a wasteful number, since it uses less digits than its factorization.

7881615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 337 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 7881615 is about 2807.4214147506. The cubic root of 7881615 is about 199.0085516051.

The spelling of 7881615 in words is "seven million, eight hundred eighty-one thousand, six hundred fifteen".