6690428 has 6 divisors (see below), whose sum is σ = 11708256. Its totient is φ = 3345212.

The previous prime is 6690427. The next prime is 6690433. The reversal of 6690428 is 8240966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836300 + ... + 836307.

It is an arithmetic number, because the mean of its divisors is an integer number (1951376).

Almost surely, 2^6690428 is an apocalyptic number.

It is an amenable number.

6690428 is a deficient number, since it is larger than the sum of its proper divisors (5017828).

6690428 is a wasteful number, since it uses less digits than its factorization.

6690428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672611 (or 1672609 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 6690428 is about 2586.5861671323. The cubic root of 6690428 is about 188.4305433537.

The spelling of 6690428 in words is "six million, six hundred ninety thousand, four hundred twenty-eight".