612644399 has 4 divisors (see below), whose sum is σ = 639281136. Its totient is φ = 586007664.

The previous prime is 612644371. The next prime is 612644407. The reversal of 612644399 is 993446216.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 612644399 - 2²⁰ = 611595823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612644299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13318334 + ... + 13318379.

It is an arithmetic number, because the mean of its divisors is an integer number (159820284).

Almost surely, 2^612644399 is an apocalyptic number.

612644399 is a deficient number, since it is larger than the sum of its proper divisors (26636737).

612644399 is a wasteful number, since it uses less digits than its factorization.

612644399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26636736.

The product of its digits is 279936, while the sum is 44.

The square root of 612644399 is about 24751.6544699541. The cubic root of 612644399 is about 849.3163587256.

The spelling of 612644399 in words is "six hundred twelve million, six hundred forty-four thousand, three hundred ninety-nine".