6899778 has 12 divisors (see below), whose sum is σ = 14949558. Its totient is φ = 2299920.

The previous prime is 6899777. The next prime is 6899779. The reversal of 6899778 is 8779986.

It is an interprime number because it is at equal distance from previous prime (6899777) and next prime (6899779).

It can be written as a sum of positive squares in only one way, i.e., 4549689 + 2350089 = 2133^2 + 1533^2 .

It is not an unprimeable number, because it can be changed into a prime (6899777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191643 + ... + 191678.

Almost surely, 2^6899778 is an apocalyptic number.

6899778 is an abundant number, since it is smaller than the sum of its proper divisors (8049780).

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

6899778 is a wasteful number, since it uses less digits than its factorization.

6899778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383329 (or 383326 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 6899778 is about 2626.7428499950. The cubic root of 6899778 is about 190.3757844412.

The spelling of 6899778 in words is "six million, eight hundred ninety-nine thousand, seven hundred seventy-eight".