6778625 has 32 divisors (see below), whose sum is σ = 9904128. Its totient is φ = 4536000.

The previous prime is 6778621. The next prime is 6778637. The reversal of 6778625 is 5268776.

It is a happy number.

It is not a de Polignac number, because 6778625 - 2² = 6778621 is a prime.

It is a Duffinian number.

Its product of digits (141120) is a multiple of the sum of its prime factors (210).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6778621) 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, 53312 + ... + 53438.

It is an arithmetic number, because the mean of its divisors is an integer number (309504).

Almost surely, 2^6778625 is an apocalyptic number.

It is an amenable number.

6778625 is a deficient number, since it is larger than the sum of its proper divisors (3125503).

6778625 is a wasteful number, since it uses less digits than its factorization.

6778625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 200 counting only the distinct ones).

The product of its digits is 141120, while the sum is 41.

The square root of 6778625 is about 2603.5792670860. The cubic root of 6778625 is about 189.2549306599.

The spelling of 6778625 in words is "six million, seven hundred seventy-eight thousand, six hundred twenty-five".