6690457 has 4 divisors (see below), whose sum is σ = 6716160. Its totient is φ = 6664756.

The previous prime is 6690433. The next prime is 6690473. The reversal of 6690457 is 7540966.

6690457 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6690457 - 2¹⁹ = 6166169 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12457 + ... + 12982.

It is an arithmetic number, because the mean of its divisors is an integer number (1679040).

Almost surely, 2^6690457 is an apocalyptic number.

It is an amenable number.

6690457 is a deficient number, since it is larger than the sum of its proper divisors (25703).

6690457 is a wasteful number, since it uses less digits than its factorization.

6690457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25702.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 6690457 is about 2586.5917729708. The cubic root of 6690457 is about 188.4308156072.

The spelling of 6690457 in words is "six million, six hundred ninety thousand, four hundred fifty-seven".