2006428657 has 4 divisors (see below), whose sum is σ = 2019716416. Its totient is φ = 1993140900.

The previous prime is 2006428651. The next prime is 2006428663. The reversal of 2006428657 is 7568246002.

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 an interprime number because it is at equal distance from previous prime (2006428651) and next prime (2006428663).

It is a cyclic number.

It is not a de Polignac number, because 2006428657 - 2²⁷ = 1872210929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006428651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643653 + ... + 6643954.

It is an arithmetic number, because the mean of its divisors is an integer number (504929104).

Almost surely, 2^2006428657 is an apocalyptic number.

It is an amenable number.

2006428657 is a deficient number, since it is larger than the sum of its proper divisors (13287759).

2006428657 is a wasteful number, since it uses less digits than its factorization.

2006428657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13287758.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 2006428657 is about 44793.1764557951. The cubic root of 2006428657 is about 1261.2695394752.

The spelling of 2006428657 in words is "two billion, six million, four hundred twenty-eight thousand, six hundred fifty-seven".