6978015 has 64 divisors (see below), whose sum is σ = 14008320. Its totient is φ = 3265920.

The previous prime is 6978011. The next prime is 6978019. The reversal of 6978015 is 5108796.

It is an interprime number because it is at equal distance from previous prime (6978011) and next prime (6978019).

It is not a de Polignac number, because 6978015 - 2² = 6978011 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

6978015 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54882 + ... + 55008.

It is an arithmetic number, because the mean of its divisors is an integer number (218880).

Almost surely, 2^6978015 is an apocalyptic number.

6978015 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

6978015 is a wasteful number, since it uses less digits than its factorization.

6978015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 6978015 is about 2641.5932692222. The cubic root of 6978015 is about 191.0926425751.

The spelling of 6978015 in words is "six million, nine hundred seventy-eight thousand, fifteen".