612640009 has 16 divisors (see below), whose sum is σ = 653083200. Its totient is φ = 573060096.

The previous prime is 612640003. The next prime is 612640013. The reversal of 612640009 is 900046216.

It is a cyclic number.

It is not a de Polignac number, because 612640009 - 2⁹ = 612639497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (612640003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 929322 + ... + 929980.

It is an arithmetic number, because the mean of its divisors is an integer number (40817700).

Almost surely, 2^612640009 is an apocalyptic number.

It is an amenable number.

612640009 is a deficient number, since it is larger than the sum of its proper divisors (40443191).

612640009 is a wasteful number, since it uses less digits than its factorization.

612640009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 612640009 is about 24751.5657888547. The cubic root of 612640009 is about 849.3143300840.

The spelling of 612640009 in words is "six hundred twelve million, six hundred forty thousand, nine".